Any Help Thanks

Dont know if anyone can help here, I have just recently purchased a Ne Lawnflite 908H Ride on Mower (It has no guarantee) but company that bought it from will come to fix it, within 30 minutes of use, only wit the blades engaged the mower started to miss then eventually cut ou (did this on several occasions) and runs fine when blades aren' engaged, has anyone else experienced any problems similar. Any hel much appreciated.
Thanks for any help
-- Big_Alr
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