Hello,
it seemes I foud a "solution" - now using latest
Armbian_23.8.0-trunk.68_Bananapim5_bookworm_edge_6.4.2.img.xz
runs now for a cpuple of days.
lataest official releases Jammy and bookwork releases ( kernel 6.1 ) never done - they stopped beween 24...36 hours ( only red LED = power ON , no activity, no access LAN/UART, no log entries...)
What is different now between 6.1.x and 6.4.x kernels ?
Fred