Anyone else have problems with the 2018 Suzuki DF6A valves sticking after the engine sits for a few weeks? We have had 4 occurrences, and now another, after the dealer replaced the whole valve train and cylinder head. I believe we have a lemon. An engine should be able to be stored for a few weeks or months, without having the valves freeze up. We only have a total of 30 hrs on the engine, and the service is done properly, on time, with Suzuki parts and lubricants.