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Have you called your cable company? There may be an issue or setting with the receiver. I have never experienced this problem and have the same set up. But I do know that the tv should not be turning on when the receiver is downloading. What is the name and model number of your tv? This might help in my research of your issue
Since you just changed signal source (from what I understand) your first goal should be to determine if the problem is in your TV or your signal source, i.e. directv receiver (and btw aren't directv satellite and not cable service?!).
You do that by trying another source for the TV - DVD, blue-ray, over-the-air antenna, anything that is not your new sound source.
Once you know the sound is broken down by the TV and not the TV receiver (or the other way around) you can proceed with troubleshooting.
If you have eliminated the obvious things the tv must have a fault...
The obvious things - a night prowler with a remote, a cat walking across your remote, a ghost that likes to watch tv, somebody sleepwalking...
It is possible the infra red signal needed to switch on the tv is not coming from your remote. You can test this by removing the batteries or taking the remote to bed with you. If the tv still turns on then tape over the infra red receiver on the tv to eliminate the chance of some stray infra red beam from elsewhere being the culprit. If that stops the tv turning on you need heavier curtains or blinds or the tv moving perhaps, but if the tv still switches on it has a fault.
There is another thought. Digital TVs and digiboxes are often programmed to wake up periodically to check for software updates. Mine wakes up at 3am but it only checks for software updates and doesn't switch on the tv, but maybe this is what your tv is doing.
A further thought - a tv often has the functions of an alarm clock. They have a sleep function so they can switch themselves to standby after you have fallen asleep and then can wake you in the morning. Perhaps the alarm has been inadvertantly set for 2am?
These days it is rather anti-social to leave any appliance on standby. Rather than unplugging the set every night and worrying about the kids, why not arrange for the tv to be plugged in to a switched outlet so the kids can switch it on or alternatively use a cheap plug-in timeswitch to prevent the set switching on in the wee small hours...
Look on the back of your TV find out what input your satellite is plugged into ...right it down. On your remote find the Input buttom and select the same one as your inputs from your Satellite. turn off the TV and the satellite receiver...Wait 30 seconds. Turn the satellite receiver back on..wait 2 minutes...turn the TV back on.
Back again. It appears that the key is the order in which you connect things and switch the TV on or off. It took some experimenting to get to what's reliable. I'll spare you the details and confine myself to what works. 1. Start with the monitor cable disconnected at the laptop. 2. Turn on the TV with the source set to your regular satellite (or cable) signal. 3. With the laptop on, plug the monitor cable into it. 4. Switch the source (at the TV) to receive the VGA signal (from the laptop). Voila! To turn off, reverse the procedure.
If you hold the power button on the receiver till it turns off. It will reboot by its self. If there are any updates to get this will force them to download. However you might have a card that can't be updated. About 7 years ago they changed the smart cards, so older ones will not download new software. A new card from Dish Network is about $20.