After launching portal from designer studio, if we try to navigate back to designer studio entire application is refreshing and closing the opened portal.

Articles Referred:
https://community.pega.com/support/support-articles/secondary-portal-closes-switch-back-designer-studio
https://community.pega.com/support/support-articles/secondary-portal-closes-switch-back-designer-studio

Still the issue is happening after following the steps in the two articles.

Below exception is triggering

web.impl.WebStandardImpl) WARN    - I/O Exception occurred while writing or flushing the stream  
org.apache.catalina.connector.ClientAbortException: java.io.IOException: Broken pipe 
	at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:356) 
	at org.apache.catalina.connector.OutputBuffer.flushByteBuffer(OutputBuffer.java:815) 
	at org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:310) 
	at org.apache.catalina.connector.OutputBuffer.flush(OutputBuffer.java:284) 
	at org.apache.catalina.connector.CoyoteOutputStream.flush(CoyoteOutputStream.java:118) 
	at com.pega.jcraft.jzlib.DeflaterOutputStream.flush(DeflaterOutputStream.java:159) 
	at sun.nio.cs.StreamEncoder.implFlush(StreamEncoder.java:297) 
	at sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:141) 
	at java.io.OutputStreamWriter.flush(OutputStreamWriter.java:229) 
	at com.pega.pegarules.web.impl.DirectStreamWriter.flush(DirectStreamWriter.java:190) 
	at com.pega.pegarules.web.impl.DirectStreamWriter.flush(DirectStreamWriter.java:183) 
	at com.pega.pegarules.web.impl.WebStandardImpl.sendOutput(WebStandardImpl.java:881) 
	at com.pega.pegarules.web.impl.WebStandardImpl.doPost(WebStandardImpl.java:409) 
	at sun.reflect.GeneratedMethodAccessor72.invoke(Unknown Source) 
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
	at java.lang.reflect.Method.invoke(Method.java:498) 
	at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBootstrap.java:370) 
	at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:411) 
	at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingThrowable(AppServerBridgeToPega.java:224) 
	at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethod(AppServerBridgeToPega.java:273) 
	at com.pega.pegarules.internal.web.servlet.WebStandardBoot.doPost(WebStandardBoot.java:121) 
	at com.pega.pegarules.internal.web.servlet.WebStandardBoot.doGet(WebStandardBoot.java:92) 
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:635) 
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) 
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) 
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) 
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) 
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) 
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) 
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) 
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478) 
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) 
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80) 
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624) 
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) 
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) 
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799) 
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) 
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) 
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455) 
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) 
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
	at java.lang.Thread.run(Thread.java:745) 
Caused by: java.io.IOException: Broken pipe 
	at sun.nio.ch.FileDispatcherImpl.write0(Native Method) 
	at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:47) 
	at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:93) 
	at sun.nio.ch.IOUtil.write(IOUtil.java:65) 
	at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:471) 
	at org.apache.tomcat.util.net.SecureNioChannel.flush(SecureNioChannel.java:143) 
	at org.apache.tomcat.util.net.SecureNioChannel.write(SecureNioChannel.java:631) 
	at org.apache.tomcat.util.net.NioBlockingSelector.write(NioBlockingSelector.java:101) 
	at org.apache.tomcat.util.net.NioSelectorPool.write(NioSelectorPool.java:157) 
	at org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.doWrite(NioEndpoint.java:1259) 
	at org.apache.tomcat.util.net.SocketWrapperBase.doWrite(SocketWrapperBase.java:670) 
	at org.apache.tomcat.util.net.SocketWrapperBase.writeBlocking(SocketWrapperBase.java:450) 
	at org.apache.tomcat.util.net.SocketWrapperBase.write(SocketWrapperBase.java:388) 
	at org.apache.coyote.http11.Http11OutputBuffer$SocketOutputBuffer.doWrite(Http11OutputBuffer.java:644) 
	at org.apache.coyote.http11.filters.ChunkedOutputFilter.doWrite(ChunkedOutputFilter.java:121) 
	at org.apache.coyote.http11.Http11OutputBuffer.doWrite(Http11OutputBuffer.java:235) 
	at org.apache.coyote.Response.doWrite(Response.java:541) 
	at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:351)