I am a bit at loss where to look or how to solve this problem. 
So I have had the hl2 for quite a while. Has always worked well with Thetis and other software. 
I didn't use it for like 8 months and i began to use it again like a month ago. I updated the thetis version to the latest beta and then the latest stable release. 
However thetis loses connection with the hl2 (or the other way around) after a while. This could be after 5 min or hours. 
By losing connection I mean that thetis show a message that the connection has been lost. And reception / waterfall /etc are gone. Clicking the power button in thetis works sometimes to make it work again but not always. 
Sometimes I have to close Thetis and it works and sometimes I have to restart the hl2 and thetis. 
Now the strange thing is that during the weekend with the contest I left the computer and the hl2 powered on. And I did not loose the connection ... 
So what are the things I tried. 
- turned off power saving in windows
- removedThetis (including the database) and reinstalled it
- played with the watchdog setting
The HL2 and the pc are connected to the same network switch. I haven't had any hickups with other devices connected to it. Everything is connected with cables (no wifi)
So I am not sure what to make of this. Is this a software or hardware issue ? 
Everything seems to work fine till randomly Thetis loses the connection.
When the connection is lost the yellow link led as well as the green activity of the ethernet connection (on the hl2) go out as well as most of the orange status leds. (reset of the hl2 hw ?)