lights blink on their own

Sounds like what I like to call "a DMX Fart" .Do you have a terminator installed on the last fixture? If not, try one. You can make your own using a new (preferrably Neutrik) XLR connector and solder a 120 ohm resistor across terminals 2 and 3.

Maybe God is trying to tell the church something? lol. kidding. what fixtures are you using? And yes do you have a terminator?
Sincerely,

If a terminator is not installed will it short out the Dongle. Our lights were blinking and locking up and now the dongle stays in USB mode even when the program is not in use. goes into Demo mode when we open the program.

what lights are these?

Here are a couple ideas.

Terminator. Make sure you have it on the last fixture of each dmx chain.

DMX Splitter(Preferably either Elation DMX Opto-Branch or Elation DMX-Branch 4)

DMX Cables

DMX Splitter: The DMX splitter is really important because if you have long runs of dmx cable or you have more than a few fixtures on the DMX run, the splitter will boost the MyDMX signal, it also has less chance of system hiccups.

DMX Cable: Are you using DMX cables or MIC cables. There is a major difference in resistance/ohms in DMX cable vs MIC Cable. DMX signal likes to be on 120ohm data line. MIC cable tends to be around 600ohm or so.

I run my lights at church through MyDMX then through the Elation DMX-Branch 4 then I send separate lines to each side of the room, then always on my last fixtures I put terminators.