Hello all. I bought about a month ago a Carvin x100b head from someone on Reverb. So far I've really liked the head and is serving its purpose, but last week I started having trouble with the loop, where it's very quiet when switching it in. Bypassing the loop goes back to the normal volume. It doesn't do this every time but enough where I suddenly can't rely on it. I know it's a solid state loop, so it's not a tube issue or something simple like that. I've tried flipping the switch for the signal level and it doesn't seem to make a difference. Is this a known issue with these amps? Mine is a 2014, which should be well after they addressed the volume issue with these amps, which actually was a problem with the loop from what I understand.