Filter should have been dirty and wasn't v7

@Cathy P How long did you let the filter dry off for? It is possible that the filter had little water left on it which managed to get into the device’s hardware, causing such issues. 

@Cathy P Also, usually when the vacuum cleaner shows a solid blue light and the machine stops working after a few seconds, it means that the device needs charge. Since you mentioned that the device already had been charged prior to use, then there are chances that either the charger has become faulty, or that there isn’t enough voltage being properly transmitted in the wall outlet you’re using to charge your vacuum cleaner.

I should have been clearer. Water couldn’t have been the problem because I used a second clean filter once it started pulsing.

The battery is new. When I put the vacuum in the dock the light stays out. If I pull the trigger and keep it pulled while it is connected, the blue light goes on (indicating that there is current) and the machine runs for a few seconds before it stops, at which point the blue light begins to flash. I can let go of the trigger and repeat the process indefinitely.