Whatpulse keeps login out

I couldn’t see a thread about this for the last 3 pages so I expect there is none, but anyways.

Ever since I installed WP 2.x, the program has once or twice a month logged out of the computer I use. I get no error message of any kind, but I close down my computer for the night every night, and when I turn it back on, it was logged out the before mentioned times.