Official GMAT Prep Error- got logged out and timer keeps running.

Quite a few people have reported problems with the online platform, though I haven't come across this one (inactivity) yet.

As for what you've mentioned about the timer, yes, the time it takes for the communication and processing to happen does impact timing. I don't see how they could fix this, short of sending all the questions in the pool and an implementation of the algorithm to the browser so that everything can be done on the test taker's computer. This one really comes down to the speed of their servers and the connection between their servers and the test taker's computer.

Also, when the online platform first came out, I checked whether the timer was working properly (with a stopwatch). I actually found that over a period of 2 minutes or so, the timer on the test fell behind actual time by around 2 seconds. I wonder whether anyone else has noticed anything like this. At the time I had thought that it was just a problem with my computer.