Hi
Can you tell me what is in your system, do you have the ARF available ?
These issues tend to come down to 3 issues, in this order
1. Quality of USB Power supply & cable
What is the current output of your power supply
What is the power rating of the cable eg 20 AWG ?
2. WiFi Dongle
Should be RT5370, but many (alleged) RT5370 have issues
3. WiFi interference
Thx
Lee