"Playback is being used by another device." No other device in use

I am periodically getting this message when trying to log into playback and I am also sometimes outright getting kicked off of playback and then getting the message when I try to get back into playback again immediately after that. I just changed my password recently and have no other devices I view on. Any ideas? I do have a stalker who has hacked into stuff before, including the camera. I am changing the password frequently and have 2SV on, if this is not just a glitch, what else can I do?

P.S. There have also been incidents of the camera skipping ahead during playback: