clock too fast - about 5 min per day

I'm having a super weird issue I was wondering if anyone might've had something similar.

So basically, the time on my iphone is being weird, I noticed that after about 2 hours my clock is 1 minute ahead of what it's supposed to be, which adds up over time (usually like 5 or so minutes after a day).

The weird thing about it that it happens even if I set the time and date settings to either manual or automatic so it's most likely not a carrier a issue (who I also contacted and was told to contact Apple, which I did, who told me to contact my carrier... so here I am).

Another weird thing that I found is, I started a 10 minute timer on my phone and my computer and my phone finished the timer 3 seconds earlier.

I tried resetting the phone, setting up as new, soft reset, even tried a DFU restore and setting up as new, no dice.

My Apple watch, which is synced to my phone, shows the correct the time.

Resetting the network settings corrects the time, at least for an hour or two and then it's back to being a minute ahead.

So yeah, if anyone has any ideas that would be great lol