Mikrotik (x86) 5.21 Alive pacets

Hi everyone I got some problem with mikrotik x86 v.5.21.
i`m using billing abills & 3 mikrotik working with them (PPTP) vpn . 1 mikrotik x86 v.5.21 & 2 mikrotik x86 v3.30
mikrotik 3.30 working ok with out any problems.

mikrotik 5.21 gives
Error: Session Calculate / Login: gevsilv, Last Alive: 1882, Session-ID: 81f0081f
Error: Session Calculate / Login: qadavharu, Last Alive: 1920, Session-ID: 81f007ff
Error: Session Calculate / Login: qakurxvach, Last Alive: 1902, Session-ID: 81f00822

i think MT 5.21 don`t send Alive packets or something else

what can i do to fix ?

tried to upgrade to ROS 5.22 problem still exists

post open 8 days and still no answer :open_mouth:

is this normal?