Problems with wva8 at operating temperature

Hello municipality I’ve been at the forsaken for a few days. I’ve been combing the forum for nights but didn’t come across anything that could help me further. To the machine I drive a Suzuki bandit 600 of type Wva8 bj. 2002 from 57 kW to 35kw via suction blinds throttled. She ran almost 9000 km About two weeks ago the forgotten was thoroughly cleaned and renewed. Valve play is set, petrol tap has been equipped with reperatur set. Now I drive about 5-10 km with full power And it’s all good. Then it starts to run only on two or three cylinders (sounds very funny ) no more eats and goes out. Starting directly is then difficult. However, after 10 minutes waiting time it runs again as if nothing had been done. But only the next 5 km until the same game starts from the front. If this occurs I opened the tank cover and hoped for a hissing. Also unsuccessful tank ventilation is free. My guess is that if one of the two ignition coils is n has reached its operating temperature makes it maybe mukken? Bzw has exposed more due to a possibly damaged primary or secondary winding ? My question is how can I best check that, susi drive on temperature tank unscrew and measure the windings ? Until then they have cooled down too ? Did anyone have similar problems ? I’m stunned and grateful for every tip LG Marlon