Yesterday, I had some time available for a change - so turned my new TS-590SG on for a bit of listening. I got listening to a QSO on 10M (28.450.00) USB and after about 30 minutes, I noticed that all drifted high by about 50Hz to 28.450.05 Although the conversations were audible, I had to use the RIT function to bring them on frequency. I haven't encountered this type of frequency drift on any Yaesu or the Icom 7300 I own. Is this drifting normal behaviour for the TS-590SG? Although I quite like this 590SG, Im struggling to establish just why so many people rate them very highly.