When the phone goes in standby, after 10 minutes having locked the screen, it is not able to receive any notification from Gmail or Whatsapp or similar apps... anymore.
When I wake up the phone by unlocking the screen, it receives all the notifications I expected to receive.
I did several trials trying to discover the cause of the problem, and I find out that changing the SIM card (of another provider), the phone works perfectly. So, I went in the shop and asked for a new SIM card, thinking the problem was related to an old SIM card I got.
But this did not solve the problem. I am getting crazy and it was suggested to take the unit for repairing it, but I do not thinks the mobile is damaged...
Please, any suggestion that can help?
Thanks a lot in adavnce,