Pro Tools 2020.3 Ultimate and Avid S1/Eucontrol 20.1 problems

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Ive just installed 2 new avid S1's on my 2010 Mac Pro tower[10.13.6 High Sierra,2 x 3.33 GHz 6-Core Intel Xeon] with both units to one netgear ethernet switch to port 1.
PT 2020.3 ultimate HDX [current version]
Eucontrol 20.1.
for one the audio meters on S1's are sluggish.they stick and are generally unresponsive.
as soon as I go past 12 tracks the whole PT system is jerky, delay in changing outputs.
plug ins launch but immediately disappear.I also try shift launch,they stay on screen a little longer then collapse again.
track 12 fader pops up randomly and won't collapse.
if I delete tracks back to 11 tracks its fine.
I thought running S1/ Eucon was going to kill my Fader port 16 but something is way off.the Faderport is way more responsive and glitch free.
my rig is a mess now.
I reinstalled the eucon 20.1 app and PT 2020.3 twice, power cycled units etc
also PT won't see the S1's,if they're powered up before I launch PT,
I basically have to turn on the S1's after the PT session has launched
I called avid support and was disconnected twice then got a guy telling me someone might call me back..when?!! he would not say.
please please I don't want to go back to that crippled faderport 16.