Try to be a little more specific, don't think many people here understod what you meant. Beacuse you first say you can't connect, then you say you get in but get disconnected after some minutes
Will try to share my experiens with you'r problems. First of, the 'server is undergoing insp...' problem. I have noticed that if I have no internet connection of some reason, that message will show up. I'm on a 100mb line so no modem dial up problem or finite bandwith can be the cause of it (at least not to my knowledge). Maybe you have some other program running that steals your bandwith. Or you'r connection is a little messy at the moment.
To the other problem of your's. I get trown out of the game too. So do my guildmates. When it happens more than three times in a row in a short period of time, then it can be a little annoying. Only cure for this is a prescription for high blodpressure. Or quit playing at all. But usually to my experience, this error is one of those hit and run one's. It shows up, messes a little with you and then disapears off to probably mess with someone else on the server. Only to come back later to make sure you take that medicine the doctor gave you.
