I've owned one since I bought it new quite some years ago now and never had a problem with it yet.
I've seen others post about random problems but I can't say I recall seeing any that were common issues.
My R75 has stopped tuning. Turn the knob, nothing happens. Researching this, it appears an optical sensor system has failed. Other R75 users have commented on this on R75 user groups. I have had my radio for several years also, it's my favorite.