Problem with incoming connections in RUT200

I have noticed with multiple RUT200 in passthrough mode that SSH connections from remote server into end device tend to fail. The connections will initially work but after a while (couple of minutes) the ssh client receives connection refused error. I also have hundreds of RUT240 with similar configuration but these work reliably.

So far I have tried different FW versions ( 00.07.07.1, 00.07.03.3 and 00.07.06.3) without any improvement in reliability. The routers receive static IP from our private APN and this is passed on correctly. The network is not connected into the internet.

It seems that all RUT200 are affected. I tested now three brand new RUT200 and all three randomly start refusing incoming connections in passthrough mode. If I had configured the firewall wrong, then it should outright refuse all connections but now it seems to be random.

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