Well, he noted that the alignment is checked every 6-8 months - which seems excessive under normal circumstances, unless a lot of routine work is being done.
Based on my automotive experience, I'd pose the following:
- When the alignment is performed, is the shop putting weight in the car to simulate a driver? In such a small car, it doesn't take a lot of weight to impact ride
- Is the same shop doing the alignment every time? If so, take it elsewhere, even if it costs you a little more. I had an alignment done on my last truck (2003 Silverado, crew cab dually), and 6 months later it ate a set of front tires. Put new tires on it and had another shop align it - found the alignment waaaaaaay out of whack. Don't just trust that it's being done right, just because they always have done it
- I see nothing related to wheel bearings - a failing bearing won't always make an ungodly amount of noise, but can cause the wheel to sit off kilter; since the axle nut clamps the bearing races in place, it can prevent excessive play from being obvious. May want to have a shop slightly loosen the axle nuts, and then check for play in the bearings.
Just my thoughts, might be worth looking into...