Blak Jak valve covers (failures)

Seasons greetings!

Has anybody experienced multiple failures in the seals for NOV 14-P-220 Valve Cap?

In the last few days, we have had double digit failures resulting in much lost drilling time as well as a messy pump room. 

The issue seems to revolve around the seal, within a short time of the tell-tale showing, mud is blowing up though the cap. I have not experienced this before, but I am unfamiliar with the Blak JAK system, so unsure if this is normal; certainly on the old-style caps, mud only came through the port.

When pulled the seals are not aways cut, which leads me to think is the torque - correct?

In summary: valve caps are leaking on a frequent basis, mud is not high temp and the majority of the failures have been on the suction side, many of the seals display no damage?

Has anyone had a similair experience? If so, how was it resolved

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