I put my laptop into sleep by just closing the lid and sometimes after wake up the clock shows wrong time and date which results into web sites not loading until I change it back and then I also lose logins to my previously logged in websites and have to re-enter the logins.
I don't have dual boot so it's not Windows messing with the Linux time issue I was able to find.
I use automatic time and date with my time zone selected. Not sure what I should do about this.
I've tried to enable RTC in local time zone but that made things even worse so I disabled it again.