My 3120 keeps losing connection to network

Hi There
Hoping someone might have a quick easy fix. I have 2 x 3120 model and both are doing the same thing. It will be connected to the network for maybe 5 mins then cannot make a connection for another 4-5 hours.
Is this a software program error? Dan anyone help??

I have the same problem.
I also checked that the SIM card works fine in other phones.
Equally, a SIM card from the same Network Provider that is working fine in another phone fails to reach the Network when placed in my 3120, either manually or automatically.
This fault has developed after about 2 years. At fist it was occasional, but now it is mostly, but not always there.
Any ideas ?

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