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crash "###!!! [Child][MessageChannel] Error: (msgtype=0x35010B,name=PContent::Msg_RecordDiscardedData) Channel closing: too late to send/recv, messages will be lost"

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With a python script I have a kiosk-like screen on which there should be a pertpetual changing (delay: 20 secs) between 3 different pages with the same URL.

Works fine ... sometimes for days, sometimes for hours, then it crashes. (I don't join the entire log entries, it's some 5000 lines; so here are the always repeating lines of warnings and errors)

===========================================>

[Parent 3042, Gecko_IOThread] WARNING: pipe error: Datenübergabe unterbrochen (broken pipe): file /build/firefox-esr-HMuf61/firefox-esr-68.11.0esr/ipc/chromium/src/chrome/common/ipc_channel_posix.cc, line 727

      1. !!! [Child][MessageChannel] Error: (msgtype=0x35010B,name=PContent::Msg_RecordDiscardedData) Channel closing: too late to send/recv, messages will be lost

IPDL protocol Error: Received an invalid file descriptor

      1. !!! [Parent][MessageChannel] Error: (msgtype=0x1E0074,name=PBrowser::Msg_StopIMEStateManagement) Channel error: cannot send/recv
      2. !!! [Parent][MessageChannel] Error: (msgtype=0x1E008F,name=PBrowser::Msg_Destroy) Channel error: cannot send/recv

[Parent 3042, Gecko_IOThread] WARNING: pipe error (4044): Die Verbindung wurde vom Kommunikationspartner zurückgesetzt: file /build/firefox-esr-HMuf61/firefox-esr-68.11.0esr/ipc/chromium/src/chrome/common/ipc_channel_posix.cc, line 358

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What is happening? And why? Greetings Martin

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