Hacker?

I keep getting logged off for no reason. Could it be a hacker? Anyone else having this problem?
https://forums.melodicrock.com/phpBB/
https://forums.melodicrock.com/phpBB/viewtopic.php?f=69&t=15267
Andrew wrote:And no problem here....delte your cookies and re-log in.
Abitaman wrote:I'll eat my cookies,12 hours later I might be deleting them
-ERIC