I have had similiar problems.
Setting up my halloween display, I used the Vixen test channel feature to turn all on, and there were several times where nothing would be on. Then they would all come back on within a second or two.
During a show, there seems to be several misfires, where lights that aren't supposed to be on, are coming on very quickly and then turning back off. I've had this problem over the last few years, and still haven't found a solution.
I can say i've only noticed it with mini's. I haven't seen it on the single C-7 or C-9 bulbs that I have on some channels. Not to say it isn't happening, i just haven't noticed it.
It does seem to be limited to wireless as 4 of my 5 LE's are that way. I have a mix of LE versions and RXs on those, and all see to experience problems... though I have rotated them so much trying to fix the problem, I could be wrong.
If you figure something out, or need me to test something, let me know.