Impossible to rejoin raid battles
I have never once been able to rejoin a raid boss fight with a new team of attackers after my first six fainted, and I've gotten cheated on three legendary raids now because of it, plus a level 4 a couple weeks ago. If my 6th fighter goes down, it just lags and lags and network errors, then lags some more, then if I finally get to the screen to rejoin, it crashes, so I never get back into the fight.
After missing out on two Articuno because of this problem, now I almost always use my Blissey as my last attacker to make my original group last the whole fight. However, since the latest update said, "Resolved a bug causing Pokémon GO to freeze after all 6 Pokémon faint during a Raid Battle" and we only had a group of ten for a Lugia fight today, I figured I'd skip the Blissey and use all strong attackers. My last fighter went down with about 55 seconds remaining on the clock, then I just stood there waiting and waiting and waiting for it to let me do anything. It finally made it to the "All your pokemon have fainted" screen with 8 seconds left on the clock, then when I tried to tap out of that, it just froze and I had to force close the game.
Fortunately, the rest of the group didn't quite manage to beat it in time, so I was able to heal up and try again for round two. This time, I deliberately let my fighters faint quickly so I would have lots of time left to try to rejoin the battle, so my 6th attacker fainted with about 90 seconds to go. It was much quicker to proceed this time, so I actually made it to the screen to rejoin the battle, but when I pushed the button, again it just went lag, lag, lag, network error, "something went wrong, please try again", lag, lag, crash." And then the rest of the group finished the fight while my game was reloading.
So then I get back into the game, nothing pops up related to the raid, so I go back into the gym and spin the disk, and still nothing but the standard items. No acknowledgement of any sort that I'd even participated, as everyone else around me is busy trying to catch their Lugia. I rode my bike 15 minutes to get there, waited another 20 minutes for people to arrive, and spent a raid pass and a bunch of max revives and other healing items, just to be the only one there who got absolutely nothing out of it.
Didn't they say they fixed this? 1/4 of the legendary raids I've done have given me this problem, although one I got lucky and it lagged for so long that it never even sent me out of the fight at all. Pretty much, though, the only way I can get credit for winning a raid battle is to use a Blissey and stay alive the whole duration.
Answers
Sounds like you need better mons or have more effort in dodging buddy. I use only one sweep of mons to deal with the legendaries and i use a snorlax in the end. When it gets to your last mon don't have it deliberately die... Just dodge the hell out of it and let the others do the work..seriously, I wouldn't consider risking rejoining had I had a problem like you.
That's exactly what I was doing on two of those times, dodging every attack with my Snorlax, but then I got dodge glitched by a blizzard and thrown out of the fight when my Snorlax still had close to half its health left. There's not much I can do about it when almost every one of my fighters gets dodge glitched, which often means my next attacker takes an undodgable charge attack to the face while I'm waiting for it to switch. Or sometimes the game lags for the exact fraction of a second when I need to dodge, then it interprets my swipe as a tap, so I get hit for the full damage.