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If your DirecTV receiver is changing channels on its own, it is likely due to UHF interference.
Source: https://www.devicemag.com/why-does-my-cable-box-change-channels-by-itself/
The utilization of these bands, operating within the 1 to 2 gigahertz radio spectrum, expands the range of services offered, reaching the upper end of the ultra-high frequency (UHF) band.