VOIP - Hawawi E173 Dongles Over Asterisk Get disconnected randomly

I Have A Linux PC With Debian OS, 8 Dongles Hawawi E173 Connected to the PC, 4 Dongles Over Mother Board and 4 dongles Connected to USB Card, We are terminating Traffic Through this PC, we are getting Supper Prim um Quality and Connectivity but we are facing 1 Problem only, LOW Average Call Duration, we are getting 2min to 3 min ACD since it Must be Between 6min to 8 min ACD i have tested live calls to see what is happening, while in a call through the Dongle i can see call disconnected Randomly, maybe after 4 min maybe after 15 min maybe after 2 min, but the Dongle Person Side can Hear a Long Tone when call dropped, Call waiting is disables, Latest Dongle Driver Installed, we removed all dongles and tested with 1 dongle only and the same issue, any one have an idea whats going on and can fix it ?