Mobile data unavailable

[morocco]

For the past two months, my telephone regularly disconnects from access to mobile data when on mobile network. It shows "4G" on the notification bar, but no access to internet. The only way to get access is to restart the phone, but it disconnects itself one or two hours later. This is not an issue with the network, since things are fine when I restart the phone and I did not have this problem before with this phone and I did not change the SIM card. Any help would be appreciated. Thanks

[Uliwooly]

@morocco

Settings > about phone > status > signal strength > what do you see?

Settings > more > internet settings > accept > restart the phone test it 

if you experience the same > boot on safe mode for couple of hours and test it 

you might want to consider get a brand new SIM card, make sure that it is the correct size not a trimmed/cut SIM card.