Hi, I am having an issue with my Amplifi TT. When I turn it on and use a clean tone it sounds completely fine and clean, but if I continue playing for about 10 minutes, the clean tones start to sound fuzzy/distorted. Without me changing any settings or volume controls. Anybody have any ideas? Thank you -- edit -- It seems the issue happens whenever I go from a clean tone to a heavily distorted tone then back to the same clean tone. Still would like to know how to avoid this probably, I do want to be able to change tones whenever I want. Also when power cycling the device, I need to wait a few minutes before it will go back to normal again.