2010 VW Routan aka Dodge Grand Caravan – loses electric power on bumpy road

Hi guys,

I have a 2010 VW Routan, basically the same thing as a Dodge Grand Caravan and had a problem this past weekend. I was driving in the mountains on a very rough gravel road with lots of washboard and after a while the van started intermittently loosing electric power. Everything would shut off – all gauges, lights, radio, engine, etc and then turn back on in a couple seconds. It did this every time the road was rougher I had to drive really slowing to get back to civilization. When I got back on the highway, it was fine again. I checked to see if there was any loose wiring on the battery and the alternator but it looked ok. I also checked if the fuses were all still firmly seated and they were so I’m wondering if anyone has seen this before and/or if they have any suggestions.
Also, I bought a new battery for the van about a month ago so I’m also wondering if maybe there isn’t a problem in the battery itself.

Thank you in advance!