HTC Droid Eris :: 3.5 MM - MP3 Listening

I listen to MP3's with headphones quite often while @ the golf range about 2-3 times a week. I just plug in a random non OEM 3.5 MM earbud headphones (like the white apple one lol ), but sometimes more often than not the eris goes buggy and starts fast forwarding through songs / skipping songs / playing at a faster rate. It seems to this when you press or slightly wiggle the 3.5 MM jack on top, so when it's in my pocket i 'accidently' hit it sometimes. Now i dont know if touching the jack is why it's doing this but that is just theory/conclusion. Does anyone get this problem (people who use headphones while playing sports or having the phone in their pockets?) and/or does anyone know why it happens or how to fix it?

- Another question i have is an accessory question but ill go ahead and ask it here to kill two birds with one stone. Can anyone suggest a good OEM earbud headphone for the Eris? I saw some that aren't actualy 3.5 MM jacks but plug into the Mini-USB port on the bottom, I wonder what kind of headphones came with some people's eris'.