ender

I have an Integral DVXi with 30 cameras coming in through a multiplexer and lately the feeds are jumping from one camera to another. I found an old FAQ on the Pelco site that had the question listed but no answer! I've tried rebuilding the database, reinstalling from scratch, and nothing works. Is it the multiplexer failing? I'd love to replace the entire unit but don't have the budget for something better until 2015. Thanks.