Solutions
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paulbates's post in Reboot PLM remotely was marked as the answerThe combination of older PLM and flaky behavior says it's time to get a new PLM and handle the swap on your terms, not when things get a lot worse and it stops working.
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paulbates's post in I hosed the network settings was marked as the answerAlso possible-to-likely is that the new router's ip4 subnet is different than the old router's.
Via the mobile app:
Settings Systems Pick your isy Scroll down to "local connection settings" Your ip and ports will be listed there