[Unsolved] Two buttons not working propely.

[Robbins]

I've searched and found a few solutions with similar problem, but didn't help me.

I was very smart two days ago. I traded my TI2 Polar, to a TI KB +300$.
Now I discovered that there are two buttons that doesn't work properly.

Filter Section:
By pressing "Edit" I can only be in the edit menu for 1/8 of a second.
When I press "Filt 1", it takes me to the "Store" screen.

I've tried to reset by holding down the arp edit button while pluging in the power cable. It was reset, but didn't help. Then I tried to reload OS. didn't help either.

Any tips?