I just registered because I’m frustrated by this issue as well. First cars at my home were two 240DLs that ran beautifully and just refused to die, so I was expecting the same quality. Anyway, Here is my journey:
Initially bought an S60 T5M FWD that had a very annoying vibration issue above 60 mph to the point of my knees being sore after my daily commute. Took the car in 4 times; they replaced one wheel and three tires that did not pass the road balance test only for the issue to reappear a few miles later.
During this time I had a few loaners (2 S60’s, 2 XC60s, ...) 3/4 had the problem. Had the Service Manager drive with me who noted the issue. Escalated to the “Engineer”. Even the GM took my car home to test it. After multiple failed attempts they decided to trade it in for an XC60 loaner T5M FWD, 20” wheels (the only one I drove that had no vibration).
One month later the issue starts with the XC60! They replaced two tires. No luck. Took it to the best tire shop I could find in the ATL area (Road force+ in car road force). They mitigated the issue significantly (Vibration started above 75 now) but at the end they figured it must not be just the tires.
It’s frustrating because now I’m stuck with an expensive car that rides worse than a Hyundai Tucson rental I drove on a recent vacation (and with better lane keep assist on top!).
Funny enough I bought the S60 two weeks After I got my fiancťe an XC90 T6 Inscription w 21” wheels that to this date drives like a dream (knock on wood!). Reading the bulletin above seems there is little hope for my FWD SUV.
Sorry for the long post; I just want to say I feel your frustration; hoping this nightmare has a happy ending.