Wifi, data and gps connections not working...

The other day my data and wifi stopped connecting, and even going into settings and forcing them to connect was not working. The gps started doing something similar yesterday as well.
I've tried restarting the phone, removing and reinserting the SIM card and turning on to airplane mode and then off again. After multiple time doing that, the connects did return for a while and were working normally, just to cut out again today.
The wifi keeps looking like it switches it self off. The data looks like it is on, but doesn't connect. it's not giving me any error messages either. And the GPS just cuts out regularly.
And in addition, it's restarted the phone a couple times itself....
Any ideas of what I should do about it?
I have an LG G3
I'

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