Stream Client Window randomly minimizes itself when using Mouse/Keyboard and does not recover to fullscreen afterwards

[Aeleks]

Hi, im using Steam InHomeStreaming for a while now, streaming Games, the Desktop (via the MSPaint trick) and Programms like Adobe Premiere from my Workstation PC (Win7 Pro, Geforce GTX1070) to a ASRock BeeboxPC (N3150, clean Win7 Pro, connected to my Samsung TV) via my 1000ish Home-Lan... and it works (besides this issue) perfectly all the time, almost no lag, constant 60fps at 1080p, good image quality and so on.

For a few weeks now i have the constant issue that the Stream Client Fullscreen Window randomly minimizes itself and refuses to recover afterwards ... this exclusively happens if i use mouse and keyboard, cant recall this ever happenened while using a controller.

Only two fixes i have found so far, are:
- A: strg+alt+del (on the client) and then kill the streaming-process via taskmanager ... to restart the stream manually again, or...
- B: go/run to the Host-PC, minimize the Game/Programm and then maximize/fullscreen it again,...this almost always seems to bring up/revive the Stream-Window on the Client-PC.

Its super frustrating if this happens while playing a online game like Elite Dangerous (died a couple of times because of this) or when editing videos in Premiere.

I've checked the Client-PC for everything that could possibly force a "minimize Window" action, but there is literaly nothing. Its a clean Win7 Pro installation (up to date of course), with almost only Steam and the Comodo Firewall (silenced, so no popups) installed on it.

This issue seems to happen more and more often, about half a year ago i had this maybe once a day, now it sometimes happens almost every 10 to 20 minutes ... no clue what is causing this.

Hope i'm not alone with this.
Anyway, Greetings

PS.: before you ask, i do not use the steamlink app of my samsung TV because it literaly force-disables the remote control, ... making it impossible to change TV- volume, brightness ect.