Why does low power factor make my LED bulb and clock radio flicker at 0.2 to 3 Hz?
Low power factor is often an indication of harmonic distortion of the load current. Every type of electronic device connected to AC power has the potential for harmonic distortion. Electronic loads may or may not have built in harmonic mitigation. The percentage distortion is like to me greatest with light load conditions, but the total distortion will be low unless all connected loads are generating harmonics.

Harmonic distortion and other types of electromagnetic interference generated by electronic loads could be interfering with some other electronic devices.

It is difficult to know if you should replace the harmonic generator or the items being interfered with. A third option would be to just put up with the annoyance.