My sister recently had this feeling that our grandpa needed his pacemaker checked out. Didn’t think anything of it until my mom said she was going to take my grandpa to the doctor for his regular blood work. After she told my mom, my mom agreed that she would see if they could get him in to check on the pacemaker.
They get there, and they had an opening where they could go right back and check it out. Turns out some setting was way off which caused his heart to be beating a lot slower than it should be beating at.