Losing data connection when wifi off

Got a curious issue with my FP2. When it loses a wifi signal, the network signal shows strongly with 4G, but is grey instead of white and wont connect to anything. Sometimes it changes back white in a few seconds, other times it takes up to 15 minutes. If I toggle flight mode or reboot, it completely loses the network signal and wont find it again for a while, even if it then reconnects to wifi. Trying the sim in a different phone works fine.
It also goes through spells of randomly rebooting,sometimes when its not even being used.
Tried a factory reset and both issues still occuring. Disappointing if its reached the end of its life after just under 3 years. Any ideas?

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