Keeps asking me to sign in

That suggestion seems to work. Thanks

That will solve it but defeats the purpose of the Safari privacy feature. Comcast should fix this because there's not reason it needs to be doing 3rd party tracking for customers logging in to their own Xfinity account.

A better solution is to select "Safari > Settings for this Website" and uncheck "Enable Content Blockers".

This will only disable the privacy feature on the xfinity.com website, not all websites you browse.

Infinity Stream on Safari Issue on MacBook Pro - This has just started happening to me the last couple of weeks.  I had not changed settings or computer etc.  I do have "Prevent Cross-Site Tracking" checked and I am not willing to uncheck that becasue it seems improbable that Xfinity would require me to allow ALL websites to cross-site track me and removes an important security feature.  I DO NOT have content blockers enabled under "Setting for this Website" which I would think Xfinity would be good with rather than opening it up for all websites.  This needs to be corrected as we utilize Xfinity Stream on our computers almost daily and it has become unusable for us.  If there is another fix or if it isn't going to be workable without allowing all cross-site tracking, we need to know to make other arrangments.  Thanks. 

@mann27 Hi, we are working towards addressing this issue for an upcoming release. For workaround, please either 1) uncheck Prevent cross-site tracking, or 2) try a different browser other than Safari (such as Chrome or Firefox). Let us know if issue persists. Thank you

The issue persists.... None of that works and the terrible app is one of the many reasons I wish Xfinity weren't my only option!

I am having a similar issue that occurs on Edge, chrome and fire fox. When I am viewing my security cams live via xfinity home, I get frequent messages requiring me to affirm I am still there. And despite sellecting "keep me signed in" I get automaticatically sgned out on a regular basis. I am new to xfinity security but having second thoughts. The issue is really annoying.

Any updates on this, I stream xfinity on my fire tv, same issues, regularly logs me out and is extremely annoying to the point that I am looking for other options.  Do you know when this will be fixed on Fire TV (happens on Roku as well).  For example, I log into NBC app on Fire TV, Roku, etc, it logs me out regularly and makes me go through a 5 minute process to re-login.  Any help would be great on how to fix this issue.

If you're concerned about online privacy then re-enable Prevent cross-site tracking and stop using Xfinity's site to watch live television. Instead, watch live television at the source website (ie: cbs.com, ESPN.com, etc.) while signed in with your Xfinity account.

I have the same issue with my mac as well and I have tried the "fixes" with no prevail. It is absoutely annoying. I shouldn't have to go to a different website to watch what y'all provide. I want to use the Xfinity stream website just like I used to. I hope with all these rate increases Xfinity is imposing they can allocate some of that money to improving their steaming capabilities. Probably not but wishful thinking. 

This issue is not new. It has been happening for over 1.5 years and I have called to try and resolve it and literally not one representative either knows why this is happening or how to resolve it. It’s absolutely ridiculous that it has not been addressed. 
Solution should never be to disable a privacy feature. Maybe get a team together to start tracking theses calls and look into what the pattern is allowing for a permanent resolution.