tornado 4000.1

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Good evening. Faced with the problem of tornado 4000.1. The amplifier consists of 4 half bridges. Individually, each operates at a frequency of 100 kHz. 3 out of 4 are also launched, but not one does not work with one half bridge. If you include a pair of output constant -1.8V. if you turn on all 4 the output HO transistors explode in two half-bridges and LO in one. Already went through everything and replaced everything, but alas
 
oscillograms of work. Measured about ten minutes ago. Two half bridges, but do not work together
IMG_8285.jpg

IMG_8288.jpg
 
What else can I attach to the message? Honestly, already tried everything
changed the gate resistance, feedback circuit, also changed the throttle in some places
swapped choke from different half bridges
 
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ndividually, they both work. Two 21844 are now installed, and they do not interfere with each other if you include one at a time. There is a sound, at the output - 0.09 V
I just can not understand why they do not run together, they are on one level shifter. just the other two in pair work

output transistors explode only if you start a "bad" half-bridge with another level shifter
 
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