Just thought I would add my experience. All my vans did this when lighting up after storage but soon disappeared. However my present van does this every time it is ignited it is worse using on electric. There is not any fault as I had my van serviced recently so all is running OK but it's so annoying.
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets