Hello B-One;
Check the usual suspects.
1. power to hub - secure at wall outlet; secure where it plugs into the hub.
2. hub to host PC - secure at both ends.
3. RTL sticks - snug and securely connected.
When you hold an RTL stick in one hand and wiggle the USB connector with your fingers, does it move? Could be a cold solder joint.
Turn on "Tuner" logging and let it run. After it fails, post the log file here. It may have some clues.
Thank you very much! Here is a portion of the log. There are several lines below the bottom line that I did not include because they were all the same text.
Log file originally created as .\R00000007\Tuner-20170104.LOG Version: Unitrunker 1.0.32.7
PLL LO 855257500 prescale 1 Quotient 59 SDM 25587 error 79.
gain 92 7B FC E6
PLL LO 855257500 prescale 1 Quotient 59 SDM 25587 error 79.
PLL LO 855257500 prescale 1 Quotient 59 SDM 25588 error 216.
gain 92 FB FC E6
PLL LO 855257500 prescale 1 Quotient 59 SDM 25588 error 216.
PLL LO 855257500 prescale 1 Quotient 59 SDM 25590 error 73.
gain 8B FB FC E6
PLL LO 855257500 prescale 1 Quotient 59 SDM 25590 error 73.
PLL LO 855257500 prescale 1 Quotient 59 SDM 25591 error 150.
gain 88 FB FC E6
PLL LO 855257500 prescale 1 Quotient 59 SDM 25591 error 150.
PLL LO 855257500 prescale 1 Quotient 59 SDM 25593 error 67.
gain AE 7B FC E6
PLL LO 855257500 prescale 1 Quotient 59 SDM 25593 error 67.
PLL LO 855257500 prescale 1 Quotient 59 SDM 25594 error 144.
gain 88 7B FC E6
PLL LO 855257500 prescale 1 Quotient 59 SDM 25594 error 144.
PLL LO 855257500 prescale 1 Quotient 59 SDM 25596 error 2.
gain 8A FB FC E6
PLL LO 855257500 prescale 1 Quotient 59 SDM 25596 error 2.
PLL LO 855257500 prescale 1 Quotient 59 SDM 25594 error 144.
gain 8A FB FC E6
PLL LO 855257500 prescale 1 Quotient 59 SDM 25594 error 144.
PLL LO 855257500 prescale 1 Quotient 59 SDM 25593 error 67.
gain AE FB FC E6
PLL LO 855257500 prescale 1 Quotient 59 SDM 25593 error 67.
PLL LO 855257500 prescale 1 Quotient 59 SDM 25591 error 150.
gain 95 FB FC E6
PLL LO 855257500 prescale 1 Quotient 59 SDM 25591 error 150.
PLL LO 855257500 prescale 1 Quotient 59 SDM 25590 error 73.
gain 83 FB FB E6
PLL LO 855257500 prescale 1 Quotient 59 SDM 25590 error 73.
USB::USB::Background interface(0) fails, 0000001F.
USB::USB::Background interface(0) fails, 00000079.
USB::USB::Background interface(0) fails, 00000079.