My photoshop periodically forces me to 'save as' as if it lost the file path or something. It treats the file as if its the first time being saved.
'Command S' prompts the 'command shift s' command rather than simply the 'save' command.
In 'history' it displays an odd 'cancel save' notice accompanying this phenomenon.
I cannot find anyone with a similar issue so I posted this. Currently there is no fix. I either save a million copies of the file with different names, replace the file or reopen the file and lose all the changes.