RUTX50 Dns resolution and IPV4 connectivity started to fail every few minutes

Hello,
I’ve been having some unusual problems with my RUTX50.
Looking at the events log I can see that every few minutes (sometimes every few, sometimes every 10-20, sometimes nothing for hours) it gets the event “DNS resolution started to fail” and “IPV4 connectivity started to fail”.

During those times it’s impossible to load anything online for 15-20 seconds and then it starts working again.

I have another RUTX50 in the same city, connected to the same tower, same provider and same settings (other than SSID etc) and it’s working faultlessly for 2 years now.
The older router is running older firmware, 07.07.1, so I even tried downgrading the newer RUTX50 to the old firmware which stopped the DNS resolution/IPV4 started to fail for a few hours but then it started again.

It was running the newest firmware when the issue started (has been running fine for a month before that).
Restarting the connection works sometimes but not always.
Tried using 4G only, didn’t help.
Disabling IPV6
What else can I check or do?

Any ideas would be much appreciated

Hello,

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Thank you,
M.