This is pretty irritating now, but if I get disconnected during a boss fight, when I try to log back in, I just get disconnected again. I have tried disabling recount and then logging in, and that didn't work, I just get disconnected again. And then I try the , disable all addons, and log back in, and what do you know, it let me in. However, stock UI == teh suck. So, what addons could be/are the culprits in preventing you from like logging back in during a boss fight? ><
Our raiding group was having this issue recently, and I found that the problem was not necessarily caused by an add-on that you are running, but rather add-ons that others are running. The problem is being caused by an overload of communication, which during high communication events (such as starting a boss fight) a lot of people get disconnected due to the spike of information. You can do the following, and if you know the group that you are running with, you can suggest that they do the following as well.
1. If you are running PallyPower, and are not a Paladin, turn it off; you likely don't need to know who is assigning what Paladin buffs unless you are the raid leader or are a Paladin yourself. PallyPower does a large amount of communicating (too much in my opinion), and it can cause people to lag.
2. If you are running ZOMGBuffs, turn off the portions that communicate with PallyPower, namely the Blessings/Blessing Manager portions of the add-on.
3. Turn off Carbonite/Questhelper/Quest Guru. These add-ons attempt find locations of people/places/things, and send messages to others, causing them unnecessary network traffic.
4. Turn off all gear score add-ons, these are constantly checking on the gear of others, which ends up causing them network issues.
5. Turn off scrolling combat text. This includes both the SCT add-ons, and the built-in SCT option. This is especially important on AoE fights such as Onyxia.
6. If you have any other add-ons that might want to communicate with others as opposed to communicating with the default interface, turn them off. This might include any add-ons that check gear, professions, etc.
7. Turn down your video settings. Try putting everything at the lowest settings. I personally have been running with my settings at the lowest possible during raids, and adjust them when I am no longer in the raid. The specific ones to look at are viewing distance and particle density. However, you may need to increase your particle density if you are having problems "seeing the flames".
You may still have issues, but these were the add-ons or settings that I have found that corrected most peoples' issues.
Also, your loading time will also be affected by addons that load a lot of data. QuestHelper is a double whammy because it not only spams comm channels, but it also loads a ton of data; this is why people frequently get disconnected trying to log into Dalaran with it enabled. You might also try disabling combat meters (Recount, DamageMeters, etc), which not only store a large amount of data, but are also trying to parse the combat log immediately. Any data-heavy addon, even if it doesn't do any processing (such as LightHeaded or AtlasLoot) adds significantly to your loading time.