Cable is likely the issue. @TrevorVR recently discovered his logitech wheel was causing interference with his TV on Hdmi. So might be an idea to test for outside interference.
File a support ticket if able to in the header.
@anon74848233 please add to earlybackers
I have the same problem, 5k+ received yesterday and ticket opened
Backer or pre order?
Please post ticket number
Iāve just received my 5k+ and have the same issues - black screen every now and then and white dots.
Support ticket SUPEN-2166 raised
Backer 5252
iāve got the same issue backer 54** but ony white dots 
one year waiting and unplayable today.
Please HELP !
Thatās unfortunate seems to be a bad batch of cables. 5k+?
Backer here with the same issues
opened the ticket SUP-106 and hoping for the bestā¦
yes, I wonder if it would have made the difference if I stayed with 8k
With this being potentially cable issue. Probably not.
Iām still waitingā¦
First I was asked to wait for ācollect a few backers for pickup informationā and when Iām available this week. The week is nearly over and the last answer I received was on 28/02/19.
Edit: Latest activity: Your request status changed to Discussing .Today 11:08LATEST
@anon74848233 @Doman.Chen @Sean.Huang @PimaxVR @Alan.sun
Update:
A few days past and a few things happend in the last few days.
I was contacted by mail from @Sean.Huang . He told me to send it by myself to their UK warehouse. And that Pimax will refund the shipping costs. The package should arrive soon in the warehouse.
When will my new headset ship?
The latest activity on my ticket:
sean huang changed the status to technical supporting.
sean huang changed the status to HMD Replacement Service.
Can anyone help me with this? Tagging a few people:
@Heliosurge @anon74848233 @Doman.Chen @Sean.Huang @Alan.sun @PimaxVR @PimaxUSA @Pimax-Support
I received a new headset today and it has the same issues with the white sparklesā¦ Not so bad this time but seriouslyā¦
Edit: it started to go black againā¦