Make sure that the IR cables are connected properly in the Slingbox and the TV source, besides you should try to reconfigure the remote control in the Slingplayer, just go to Setup.slingbox.com and use the option "Configure Inputs", there you can configure the remote control again.
I just spoke to DTV and the tech guy said tht you caturn off "Power Saving" in the menu. I assume that will fix the problem that we are having.
1. Go to Menu
2. Go to Settings & Help
3. In Settings find Power Saving and toggle to turn power savings off
I'd be willing to bet this fixes it. At worse, the receiver may need to be left on while you're travelling.