I was wondering if anyone else has had similar situation. I use a Garmin 500 Edge
have had this one for a few years now, about 4 to 5. works amazing.
However in last 2 months its been acting weird.

I at times can not access my Page/Menu button
i turn on the Garmin and can access my timer, it still records my rides etc
but i can't select my Page/Menu pages.
tried many times
tried holding button down for a long period.
also pressing many many times

then all of sudden it will decide to work properly sometimes too

also i can't calibrate my power meter at times
it lets me select the option
but then when i select Yes , it wont let me enter, as i have to press the Page/Menu button and nothing

I have tried a hard reset of the Edge and nothing cleared up

Any one have suggestions or had a similar situation? thanks

I just had a similar problem resolved (my thread is on the front page now) by contacting Garmin via their chat. I had to reformat my 510 via a PC. You might look into that. It took about 15 minutes.