There is a "time out" feature on the Forum.
No activity for (approximately) an hour, and you will be logged out.
Security feature for your benefit, should you walk away from the keyboard.
It also helps limit how many simultaneous connections the server maintains. Fewer connections, and the forum runs faster.
The Google "Deceptive Site" warning was simply due to running an older version of the Forum software.
Never a true threat to members.
Took awhile to get the update downloaded and installed, but we are current now.