After being hammered episode after episode for decades I too noticed cognitive issues that I could not attribute to meds. The good news is that since I have been episode free for 15 months (a record for me), and PTSD free for five months I have noticed things improving. This could be solely due to the fact that I was put on a low dose of Ritalin (for this reason, and mild ADHD) two months ago, but I am sensing it is both my brain beginning to heal and the Ritalin.

BP episodes have an enormous impact on our brains. The more severe, and more frequent, the worse it gets. As you have said in the past (if I am not mistaken) that you have had a history like this my guess would be it is the BP episodes themselves that are behind your typing decline. Still, it is best you check with your pdoc and if needed see a neurologist just in case it is something else. I really hope you can keep the episodes at bay and find a return to your previous functioning.