Raid error kicks me out completely
2 times today I was trying to raid Regirock at 2 different gyms with a private group and after 120 seconds of selecting my party when battle immediately starts, I get a flashing error message I can't remember what it said, something to the effect that the raid no longer exists and I was no longer able to rejoin the same battle and they weren't going to start all over again due to it being part of a lucky egg for others. Has anyone got the same error message? I tried Google searching but couldn't find anything other than this was a common problem over a year ago. I tried to report this to Niantic but got robotic responses from them.
Answers
While I'm not familiar with the empty party trick, I have noticed strangely my device (a Samsung Galaxy S9) would be behind by about 15 seconds in the raid time compared to another device. For example, another device would show the raid boss at hatch while my device still has another 15 seconds on the countdown. Not sure what's causing that. As far as selecting my party, I either choose my pre-selected party (a team of all machamps when it's cloudy, or replace the recommended aggrons with machamps).