I've got a VHT Ultra-Lead and last night at practice it acted a little strange. I heard what can only be descibed as a wind sound at points and at other times while playing it sounded like it was oscilating. 2 times the sound just stopped for about a second or 2. The power tubes are brand new and biased, only had them about a month. The funny thing is, after the sound cut out the 2nd time everything went back to normal. No wind, no oscilation no cut outs, just normal. I checked my cables to see if 1 was loose or shorting out but nothing. I've got a gig Friday so I plan to run it through it's paces after work Friday morning to make sure it doesn't go to crap on me that night. Any ideas?