RT-AX68U kernel crashes

[pirx73]

AX68U loses network from time to time, in the log following can be seen:

May  6 13:36:11 kernel: wl1: PSM microcode watchdog fired at 314485 (seconds). Resetting.
May  6 13:36:11 kernel: wl1: reason = psm watchdog at 314485 seconds. corerev 131 ucode revision 1626.28204 features 0x3106
May  6 13:36:11 kernel: psmdebug 0x00000024 pc 0x01ff000e phydebug 0x41 macctl 0x4160403 maccmd 0x4
May  6 13:36:11 kernel: psm_brc 0xa000 psm_brc_1 0x0018 M_UCODE_DBGST 0x2
May  6 13:36:11 kernel: brwk_0 0x2401 brwk_1 0x0014 brwk_2 0x22a0 brwk_3 0x0ff2 brwk_4 0x0006
May  6 13:36:11 kernel: ifsstat      0xaf   ifsstat1     0xff   txectl       0x481c txestat      0x405 
May  6 13:36:11 kernel: rxestat1     0x4104 rxestat2     0x1340 rcv_frmcnt   0x0    rxe_rxcnt    0x91   
May  6 13:36:11 kernel: wepctl       0x0   
May  6 13:36:11 kernel: aqmf_ready0  0x0    aqmf_ready1  0x2    aqmf_ready2  0x0    aqmf_ready3  0x0   
May  6 13:36:11 kernel: aqmf_ready4  0x0    wepstat      0x8000 wep_ivloc    0x1a   wep_psdulen  0x35   
May  6 13:36:11 kernel: rxe_errval   0x0    rxe_errmask  0x20f  rxe_status3  0x20a  txe_status2  0x405 
May  6 13:36:11 kernel: dbg_bmc_status 0x0    psm_chk0_err 0x0    psm_chk1_err 0x0   
May  6 13:36:11 kernel: PC :
May  6 13:36:11 kernel: R0: 0x24       0x24       0x24       0x24     
May  6 13:36:11 kernel: phydebug :
May  6 13:36:11 kernel: 0x0        0x0        0x0        0x0       
May  6 13:36:11 kernel: 0x0        0x0        0x0        0x0       
May  6 13:36:11 kernel: 0x0        0x0        0x0        0x0       
May  6 13:36:11 kernel: 0x21       0x21       0x21       0x21     
May  6 13:36:11 kernel: 0x1        0x1        0x1        0x1       
May  6 13:36:11 kernel: 0x0        0x0        0x0        0x0       
May  6 13:36:11 kernel: 0x0        0x0        0x0        0x0       
May  6 13:36:11 kernel: 0x0        0x0        0x0        0x0       
May  6 13:36:11 kernel: pktproc      0x101  pktproc      0x101  pktproc      0x101  pktproc      0x101 
May  6 13:36:11 kernel: TxFifoStatus0 0x1c3  TxFifoStatus1 0x1c3 
May  6 13:36:11 kernel: gpiosel      0x0    gpiolo       0x0    gpiohi       0x0   
May  6 13:36:11 kernel: gpiosel      0x1    gpiolo       0x0    gpiohi       0x0   
May  6 13:36:11 kernel: psm stack_status : 0x8000
May  6 13:36:11 kernel: psm stack_entries:
May  6 13:36:11 kernel: 0x0024
May  6 13:36:11 kernel: 0x02ac
May  6 13:36:11 kernel: 0x01dc
May  6 13:36:11 kernel: 0x0683
May  6 13:36:11 kernel: 0x00b6
May  6 13:36:11 kernel: 0x121e
May  6 13:36:11 kernel: 0x3e7d
May  6 13:36:11 kernel: 0x3123
May  6 13:36:11 kernel: 0) usr_count = 0, schedid = 0
May  6 13:36:11 kernel: 1) usr_count = 0, schedid = 0
May  6 13:36:11 kernel: 2) usr_count = 0, schedid = 0
May  6 13:36:11 kernel: 3) usr_count = 0, schedid = 0
May  6 13:36:11 kernel: wl1: fatal error, reinitializing, total count of reinit's[2]
May  6 13:36:11 kernel: CSIMON:  CSIMON[1.1.0] Initialization
May  6 13:36:11 kernel: CSIMON: M2M usr already registered ...
May  6 13:36:17 kernel: httpds (12069): drop_caches: 1

Two things caught my eye:
kernel: wl1: PSM microcode watchdog fired at 314485 (seconds). Resetting.
kernel: wl1: fatal error, reinitializing, total count of reinit's[2]

386.3_2 did not had such issues...