Still not a single issue with my Quad, 3 DVB-S tuners & 1 DVB-T tuner.
Currently has only 2 28.2E feeds, so tuner A set as 28.2E, Tuner B set as loopthrough, Tuner C set as 28.2E, Tuner D set as disabled.
It sits above my Solo2 & is now used as the main box because of the extra recording options.
Can't fault it one bit & records pefectly using all recent ViX builds including 4.x test builds.