Problem with data connection on OSD

[Guest Raihan42]

So i turn on my data connection and everything works normally but then about 30 minutes later i can't seem to watch youtube videos, download from google play and basically can only check my emails. i've tried to turn my data off and on again and that seems to work but i have to reconnect every 30 minutes which is especially annoying when im playing online games. Does anyone know what's wrong and how i can fix this?

I know it is not a problem with my sim card as i've tried another one and i get same problem (I normally use t-mobile)

I've read the other topics (the one about network problems with xolo) and they do not seem to help either

It also cannot be signal loss as it is always 4 bars and data roaming is turned on