Tvheadend

Hi everyone.

I'm new to TVHeadend but I've done a lot of reading and am certainly willing to do more if someone can point me in the right direction. My setup:

I have Ubuntu 14.04.1 running on a system with an Intel quad core i5-3470 3.20GHz processor, 16gB memory, and 1 TB sata drive. My home network is a mix of 100/1000mbps and wireless devices. This box is 1000mbps. I also have 3 KWorld UB-435Q USB 2.0 tuners attached. I'm running tvheadend 4.0.5 and had no trouble installing and getting the basic setup done. EPG is working great.

I have a mixture of PCs, tablets, smartphones, and TVs with Raspberry Pi's running OpenELEC.

I can watch live TV from any device on my network, wired or wireless, without problems as long as it is the only client OR multiple clients are watching the same thing.

The problem occurs when more than one tuner is subscribed at a time. As long as only one subscription is active there are no transport or continuity errors. So I've watched the status and as soon as another device opens a subscription on a different tuner both transport and continuity errors start piling up on both subscriptions and both streams stop fairly quick. To eliminate the network as a problem I have opened 3 separate windows on the machine running tvheadend with the Watch TV button on the EPG page of the web console and tested there with the same results. I can start a stream on one window with no issues. I then start a stream on one or two more and it falls apart. I can kill any 2 streams and the remaining subscription starts playing correctly. Using that technique I have verified that all 3 tuners work as long as they're the only one active.

I'm at a loss what to try next. Any help would be greatly appreciated.

thanks much