Husqvarna rider R315 AWD burmt two transmission belts inthe first 6 hours

mowing in ideal conditions with a bioclip deck, it does not seem able to get rid of the mulch. Dealer blames me, says wet or too long grass, going too fast, all patent nonsense. Grass 5cm, dry for days, well drained on slight slope, the grass patch about 11x4.5 metres, impossible to go fast. 1st belt burnt at 2 hours, second at 6 hours.using Bioclip deck as purchased. The deck accumulates grass under it and the pile of clippings apparently stops the blades whilst the engine is burning through the belt in about 3 seconds of blue smoke. it is impossible to know the amount of clippings under the deck short of stopping every 30 secoinds or so, lift the deck and have a look. not a practical proposition. Anyone out there with similar experience and/or advice/

Husqvarna rider R315 AWD burmt two transmission belts inthe first 6 hours