My R5000 is about 3 yrs old or there about. My stem is only a month old and I got new bars about 3 months ago...so I think that can be ruled out.

When I was at home last night I picked up my girlfriend's bike and turned the bars from side to side and it was fluid and easy. I picked mine up and it seems to be tighter turning from side to side and has just the slightest bit of resistance in the sense that it doesn't just move fluidly. Does this change anything you guys were thinking?