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Go into the menu options and see if it has a setting for alarm. It may be turning on at the same time every night to wake you up. It is also possible a neighbor has the same infrared code and is pushing their power button and it is turning your on.
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
The black square is a text box for the deaf. You can turn it on and off with the closed captioning button on your remote or from the closed captioning section in your television's menu.
However if you are connecting a cable box or satellite tv receiver you would need to turn the text box off from its menu. There is often a hidden menu that needs to be accessed on the cable boxes and satellite tv receivers that can be reached by turning it off and then immediately pressing the menu button on the outside of it. For more details about a specific cable box or satellite tv receiver call your cable or satellite company.
If you have a cable box or satellite tv receiver connected to this television, and you are using the cable company/satellite tv company remote control the captions are not coming from your television. They are not controlled by your television or your television's remote. There is usually a hidden menu where captions can be enabled and disabled. You reach it by turning off your cable box and then immediately pressing the menu button. If your cable box/satellite tv receiver does not work this way the company can troubleshoot/walk you through removing the captions. If they cannot request to speak to a supervisor.
If this does not apply to you because you don't have a cable box or satellite tv receiver then there is usually a closed caption button on your remote control even if it is under a hidden fla or there is a closed caption option in the television's setup menu that can also be accessed with the television's remote control.
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...
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.