I have been running the cable box directly to my AV receiver then to the TV for the last two days bypassing the HDMI splitter as I work on researching this issue.
Note: Yesterday the cable box rebooted again with no warning. Prior to the cablebox reboot two days ago, everything was working.
This morning I hooked the cable box to the splitter exactly the way i had it configured when things stopped working. My primary TV (TV1) is connected to my AV receiver then back to the spitter for cablebox signal. TV2 is connected directly to the splitter. Everything is working with no changes. I tried to reproduce the problem by leaving both TVs on and AV receiver on before turning on cable box, but was not able to reproduce occurance which is odd. Two days ago I had a blank screen / no video no matter if TV(1) was on / off, TV(2) was disconnected from the splitter. I did verify the splitter was working by hookikng up my DVD player to the splitter when I was getting the blank screen and that cablebox hdmi out was working by connecting the TV directl
I am going keep running the TV from the splitter and monitor for the next occurance of the blank screen / no video issue.