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The problem is a fuelling "hang" issue, it can either be an air leak between the carb & the head, which is not likely. If the bike is reasonably new to you it could be the carb main needle. I had one a while ago that did exactly this, I bought it as a non runnings spares bike. When I cecked the carbs after checking everything else, it turned out that the PO had put the needle in above the spring base in the diaphram & every so often it would hang up & do exactly this. It was one needle in one carb, pop the carb tops & check !
YMMV
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