Same here. I’m also on a FP3 (using Lawnchair launcher, in my case), and also finding that /e/ OS v1.0 has massively downgraded the functionality of my phone. To pick a few examples:
- As above, the phone resets anytime anyone calls me or I try to call anyone via an app (whether by Telegram, Signal or WhatsApp), though note that after a reset there is a short period during which I can start calls, which allows me to return them, if a few minutes late
- The camera also only works for a short period after a reset, then won’t take pictures
- The phone’s caller ID no longer works, so all telephone callers come up as “Unknown”
- The phone is generally slow and unresponsive
- …
It seems there’s no easy rollback option, so 
that most of the issues can be resolved in the next update soon