but you say 0,1uF and Paul says 1,0uF so i don't realy know which to buy.
Yes Paul made a typo.
What i am doing right now is removing all the TPIC chips and puting them back one by one to understant at what point the problem starts.
What will happen is that the more you add the more unreliable it will be. You might see it working in the short term but continued testing will show occasional errors. It is not worth doing any plugging in tests until you have the decoupling capacitors and the buffers sorted out.