From a single sentence, not much. Yes, the seals are fine, they haven’t been used enough for them to wear out and again the device has a seal test function it passes fine and nine times out of ten there’s no issue. I appreciate you informing me about what you assume the issue is, and that your initial comment was probably meant to be helpful, but beyond that I really don’t feel the need to carry on trying to convince a rando on the internet that there is a difference between intermittent failure and hardware defect. If I told you “My HDMI cable works fine, except sometimes the screen flickers black for a second.” It seems from this conversation like you’d respond “Well then your cable clearly isn’t fine.” But you’d be wrong, the cable may well be fine. The issue could be signal interference, the port, power draw, or a loose fit, or a whole list of things. The information given doesn’t prove the cable is bad, just that something in the system isn’t consistent. You don’t have enough information to make that call.