Hi guys, I have a Markbass Combo II Amp (it's a 2x10 speaker, with the amp head built in so it's a combo) and a 4x10 Gallien Krueger speaker that I put under it. My problem is in the middle of gigs, when I have my highs cranked and I'm slapping, I will just cut out. On my Markbass, the blue light is still there, the fan is still going, just no sound. A quick flicker of the switch off and back on will make it come back fine. However, it's extremely annoying as you could imagine and it needs to get fixed. This wasn't a problem for about a year, then right before a gig, I switched out a battery on my active bass (I play an Ernie Ball Musicman Stingray 4 string). I thought it was a new battery, but apparently it was old. I cut out several times during the gig and it was BAD. I looked online, and other people had similar experiences when slapping and said that if you replace your battery, it should be fine. I did that, and it was good. Then this last Saturday night at another gig, it cut out again. I was frustrated because it had been fine for about a month and a half. It cut out another 2-3 times throughout the night. My question for you guys is: how often should I be replacing the batteries in my active bass? It's weird because I had originally gone about a year without replacing my battery, and I never cut out. Now, it cut out after just 1.5 months with a fresh battery. Is the battery really the problem? Also, any other Markbass users that have this similar problem? I'm really at my wit's end here, I went to guitar center today and they wanted me to spend $400 to buy an Ampeg head to connect to my Gallien Krueger, so my Markbass Combo only had to run itself. Their theory was that the Markbass was overheating because it had to power itself as well as the Gallien Krueger. So they wanted me to bi-amp with the Ampeg to the Gallien Krueger, and the Markbass would be on its own. The only problem was that it sounded terrible, and I don't think I need to spend all that money to solve this problem. Any help is much appreciated, thank you so much.