Yes, I suspect you are unlucky. When I had my Pilot 34 I marveled at how smooth the door slid open and closed and wondered how to get in and replace those bearings or wheels if they failed. I obviously still don't know.
On my Pilot 30, when I first acquired it last year, the door (sliding companionway door) was a bit recalcitrant as you described. I washed the door sliders with a pressure washer and was rewarded with lots of vegetation rolling out the other side. That, plus a little spray graphite, improved operation greatly. A hose with nozzle should do the trick as well. Spray into the track parallel to the direction of operation. You might try just the graphite first if your boat has not been moored near trees.
i did this job on our 03 34 pilot. you will need to remove the cover to the left of the companion way. this will give you access to both upper and lower track. here is where i got ours: https://www.boatoutfitters.com/hardw...ng-door-trucks. sorry don't remeber details on the procedure, although you might have to cut an "outlet" on upper track to get the car out w/o removing the track. the cars on upper and lower track are different.