Fluorescent light fixtures are known to cause IR interference, some more than others. If you turn off the lights and no longer see the problem, then that obviously tells you that your lighting is at fault.
Certain display models have an ambient light room sensor, which works by emitting IR; this causes a lot of trouble for some IR devices. Some models, like those from Sony, have a menu option to turn this off, which greatly reduces IR interference.
Other televisions simply emit high levels of IR. Some displays only do it for the first 2-15 minutes after they are powered on, while others do it whenever they are on.
Ideally, one would confirm whether IR interference is the problem by testing the box in another room with an older "tube" TV, with ambient lighting turned off. However, this isn't always an option.
You can generally eliminate these IR interference issues by moving to RF control. You can add RF capability to most remotes with the Next Generation Remote Control Extender. With this product, place the included IR receiver "eye" over the IR sensor on the front of the Motorola box, and cover it with a small piece of black electrical tape to prevent other IR sources from hitting the STB/DVR's sensor. If you have trouble locating the IR sensor, shine a flash light on the front of the box and look for a small round circle.
Note this will not eliminate delays and the "queuing up of commands" that you will see periodically with all Motorola boxes. That's an issue that affects all Motorola equipment, regardless of provider. It has nothing to do with IR interference.
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