in 2017, I bought a new Blues Jr. III. I bought it from an online retailer. It has been plagued with problems. Pretty much from day one, it has some mysterious (to me anyway) issue where I can turn it on and play for a few minutes and it sounds great. Then suddenly, the tone becomes thin, splatty, farty, and the amp loses a lot of power. So, after the first time or two of experiencing this, I took it to the nearest music store that was listed as a Fender Authorized Service Center. Their tech looked it over, and said that he couldn’t find anything amiss. He said he did re-flow some of the solder joints, but otherwise didn’t know what to tell me. He charged me $60.00 because he said that Fender would only cover the work if he could document a problem. I really want to like this amp, as it is the perfect size and power for my needs. I have replaced the factory speaker with a WGS ET-65. Great speaker! When the amp works, it sounds great, but I can’t gig with it because it isn’t dependable. I’m not real savvy when it comes to tube amps, so I would appreciate any feedback from the brain trust. I just really don’t know what to do next! BTW, I have replaced all the original tubes with JJ’s. Any thoughts are welcome!