Given this appears to be coming from within the SoftDevice controller, are you able to advise what the following assertion would mean, please?
[ 2351007] <err> bt_sdc_hci_driver: SoftDevice Controller ASSERT: 52, 402 [ 2351008] <err> os: ***** HARD FAULT ***** [ 2351009] <err> os: Fault escalation (see below) [ 2351009] <err> os: ARCH_EXCEPT with reason 3 [ 2351010] <err> os: r0/a1: 0x00000003 r1/a2: 0x00000000 r2/a3: 0x00008005 [ 2351010] <err> os: r3/a4: 0x00000003 r12/ip: 0x21000b18 r14/lr: 0x00000000 [ 2351011] <err> os: xpsr: 0x0100001c [ 2351011] <err> os: Faulting instruction address (r15/pc): 0x0102d618 [ 2351012] <err> os: >>> ZEPHYR FATAL ERROR 3: Kernel oops on CPU 0 [ 2351012] <err> os: Fault during interrupt handling [ 2351014] <err> os: Current thread: 0x21004ef8 (unknown) [ 2354630] <err> os: Halting system