I have several Blue Pure units in assorted sizes. I love the idea of this size - the mini max - because I can put it in the middle of the dinner table without it being intrusive. But the mini I have is not working correctly. I’ve only had it for under 7 months, and I don’t use it often. I tried to turn it to high speed yesterday, but it would only go to medium speed. When I tried to turn it up, all the speed indicator lights blinked at once a few times, then it went back to medium.  Is this fixable??