It's only a cheap Motorola Moto G, but I had the same issues with an iPhone 5S, a Google Pixel 1 and a Samsung S4 when I was with them. Interestingly, I had no problem at all for the first six months or so, then started to get these problems. Switching handsets and even two replacement SIMs didn't make any difference. O2 initially told me there was a mast fault in the area and said it would be fixed ASAP. A month or so later, they reported it fixed, but the problems remained. I lived with it for another year, and ditched them for Vodafone. Never had an issue since.
We got the 5S unlocked and my youngest daughter is now using it (also on Vodafone). It works perfectly.
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