I've had this issue at this site, too. Basically it's not recognizing the Stay logged in feature.
Check your antivirus settings. Sometimes those will require constant logins.
Also if you allow your anti-virus to expire, some are programmed to be troublesome until you renew. Nothing I can prove, just observations.
Also antivirus software loves to control your computer. Mine wouldn't let me go online because it is not safe. Please, check you settings.
For Google Chrome
Go to Settings chrome://settings/
Scroll to bottom and click Show Advanced Settings.
SCroll a little bit and find PRIVACY
Click the Content settings button - A popup window will appear.
under Cookies - Allow Local Data to be set should be checked
Click on Manage Exceptions.
See if Pettalk is listed. If not, you will want to add. I think the base URL is petoftheday.com
If it is listed, make sure it says ALLOW.
And there may be a virus. I have had sites load a virus when I didn't stay and look around. I wish I could tell you what to look for.
Good luck
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