Panasonic 5-Blade Wet/Dry ES-LV61 Questions & Answers

Shaver is almost 3 years old, and quite regularly it becomes rough/vibrates while shaving. It sounds like the motor is speeding up (not as much as when sonic-cleaning but very noticeably). Switching it off/on again fixes it for a while.

I decided to see what was happening by carefully unclipping the shaving head WHILE it was doing this and I could see one of the cutters was vibrating very roughly while the other was still operating smoothly. Wondering if this just due to worn cutters/foil or is there a mechanical reason within the shaver itself?

The cutters/foil ARE due for replacement but I have replaced them several times in the past and don't remember this symptom before with worn parts.

I always keep my last set of parts as a backup just in case so I popped those in and it did the same thing so I suspect the issue is probably in the shaver. If that's the case that would be quite disappointing for the shaver only to have lasted 3 years.