Timeline not scrubbing when I press the arrow keys

Pressing the left and right arrow keys isn't making the red timeline thingy move at all. Clicking and dragging it still works, but the audio is so stuttery it might as well be tv static. and the play button is just fine, but it's frustrating and not very efficient having to put every section of the audio on loop trying to pause at just the right moment. I checked the keyboard shortcuts. It seems like the , and . keys work to move forward and back frames but the audio doesn't scrub at all when I use them. The arrow keys were working just fine a minute ago when I made the file. I saved and closed it to go make lunch, (and didn't do anything else to it) and when I opened it again suddenly the arrow keys wouldn't work. And this isn't an issue with just the audio not scrubbing, the arrow keys aren't moving anything on the drawing layer either. Maybe the keys are jammed and the program is fine, but considering things were going perfect just an hour ago I doubt that's it. Sorry, I'm probably missing something really simple and obvious. I'm good at drawing but a little slow with all the computer stuff