resizing tool not working in Photoshop

Hey all, I have been using photoshop for a few years now, and lately, my resizing short cut has stopped working now and again. it seems to work for about an hour before it no longer lets me use it. I can still fully use photoshop if it's not working I just have to manually change sizes (which is a big pain) I have changes keyboards it's not that- I have also reset all tool to original settings. nothing works. but if I log out of photoshop shut it down for a few mins and go back in and pow! it works again. but this is not time efficient and for the amount of money, I spend every year on my subscription I expect things to work properly. how do I fix this