You don't give too much information, but it's possible it's a handshake issue...meaning with HDMI sometimes components have a difficult time communicating. If so, you might check with the manufacturers of both components to see if they have a firmware upgrade.
I could also be the physical connection. Does the connection seem loose? If you wiggle the cable at the connection point, does the picture come back on? If so, most likely you have a problem with your connector. In this case, you can try a locking adaptor, such as hd ez lock by www.blueechosolutions.com. It attaches to your chassis to hold your hdmi cable in place, and eliminate the stress on your input.
Possibly also your cable. If you have another HDMI cable, you should swap it out to see if fixes the problem.