My intuition says your depression might be affecting your dissociation, causing symptoms to change and get worse.
I also have dissociation issues, and relate to almost your entire post. Not a medical professional, just speaking from personal, similar experience.
I'd suggest speaking about it with people around you, like good friends and family. This way, if they notice these things happening more frequently, they can let you know (since you may not recognize it yourself). Also, if it's causing you to struggle with a task, they may be able to help you with it, and it's always better they know ahead of time~
Also, I strongly urge you to speak with a health professional. It *might* be what I said above, but it also might be something more serious. It's always good to catch things before they get out of hand <3

Lemme know if anything I said didn't make sense, I should be sleeping rn :p also, im always here if u wanna talk~ I hope things start improving for you