IO2_DRIVER_STOPPED event on boot reset

[DjeSan]

hello, i'm writing to you because my alcatel 4400 has suddenly restarted and it's not the first time, sometimes it has to be restarted manually. i've been able to get the list of incidents, i'll show you below.
I've removed the two io2n cards and swapped them around, but still nothing.
anyone have an idea please

(857963:001806) * CPL Backtrace: 0xFFFFFF
(857963:001807) * CPL Backtrace: 0x00000001
(857963:001808) * CPL Backtrace: 0x00000008
(857963:001809) * CPL Backtrace: 0x01008EBB
(857963:001810) * CPL Backtrace: 0x0000001C
(857963:001811) * CPL Backtrace: 0x00000008
(857963:001812) * CPL CPL_BACKTRACE_COMMENT
(857963:001813) * CPL ano 00008 next_addr = 00000000 start_addr = 0203DD40
(857963:001814) * CPL msk_it_l1 = 0000DD38 rgabort = 00000000 addr = 00000000
(857963:001815) * CPL r0 = 020230E4 r1 = 00000008 r2 = 00000030 r3 = 0203DD5C
(857963:001816) * CPL r4 = 00000000 r5 = 00000000 r6 = 00000000 r7 = 00000000
(857963:001817) * CPL r8 = 00000000 r9 = 00000000 r10= 00000000 r11= 00000000
(857963:001818) * CPL r12= 0207F810
(857963:001819) * CPL @[bnvpra2 _2.06 _29Jul08_02h28
(857963:001820) End of exception message in CPL_ (0,1)
(859124:001880) IO2_DRIVER_STOPPED event on boot reset

Message broadcast by root Mon May 6 09:55:22 2024...

System stops to restart NOW!
(859127:001881) IO1 driver: read bad IO1 flag value: 0x0012
(859127:001882) IO1 driver: read bad IO1 flag value: 0x0012
(859127:001883) IO1 driver: IO1 card lost (IO1-flag: 0x0012) ! !!
(859127:001884) Stop everything
(859127:001885) SUPERVISOR -- Supervisor_Number=1605 Param0=18 Param1=-1 Param2=-1 Param3=-1

(859127:001886) SUPERVISOR -- Stop application actor