Opinions on mixing 3.30 + 4.17

My plan is to roll back any Mikrotik unit not using wireless cards from 4.17 to 3.30,

Tried 5.5 but had several CPE’s not transferring traffic,

With 4.17 a reboot which has occured about 6 times with different Mikrotik boards has resulted in shutdown and a drive out to remote sites to recycle power???,

So i am asking for opinions by users on this.