Hey there UG community. I'm asking for your help. My amp has been acting up and was wondering if you guys could help. I'll link to a video where I describe everything. If you have any insight comment on the video or respond here. THANKS!
Sounds like you have a loose connection. Probably a cold solder joint. The fact that it went away with the loud strumming suggests this as the possible cause. Unless you're good at troubleshooting electronics, or know someone who is - that's going to be your only hope.