Rob,
Are any of your Hunt Groups configured as Collective with more than 4 users?
If so, that is the reason for it.
If more than 4 channels are presented for the same call to a Compact Base, one or more phones that are connected to that specific base station will loose their registration.
Doesn't happen on regular base station, even if they get in to congestion.
Kind regards
Gunnar
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Oh, for fox sake!