Ok, I have reduced the SIP registration from 3600 to 240 and, for now, it seems to have resolved my loss of registration. I set it to 240 last night and checked just now and Voxalot is still showing my router as registered - excellent!
I have no idea why this has become an "issue" now after nearly 2.5 years...?
I'll keep an eye on it.
Thanks.
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