I read sometime ago something about it but I don't remember where...

I read sometime ago something about it but I don’t remember where… I have not tried to used my K9 with SIM and today is the day… BUT…internet stop working after a while… it seems to have signal but does not work ( and it works sometimes… suddendly you get notis… and you could be without for a hour…)… if I restart it, it works again but after a while…

I don’t find where I read it… is there any solution about it? it’s useless if I don’t have internet on my watch.

Bonus Quest: under 3G it drains bat… under 2g it doesn’t… is it normal?
Thanks