After cresting a small hill I tried to increase power. Instead I lost power for a couple of seconds before power returned. The car at that time had less than 300 miles <2010 jetta tdi >.I now have over 3,000 miles and it happens on one in five small hills. The last one lasted 8- 10 seconds. I was 100 feet down the hill at 40 mph in fifth gear and tried to increase power. Ended up shifting to forth and than to third and powering my way out. RPM went to 1100 before recovering. Going to dealer as this is a safety issue. Any thoughts.