Static DHCP entries lost

Hi to all,

recently, on three different devices (one RB751U, 2xRB433, all with ros 5.19) I have experienced sudden loss of all static DHCP entries.

I have noticed that RouterOS was rebooted just prior to that without proper shutdown. Also, free memory was quite low at that time.

Anybody experienced similar?

How to prevent it in future?

Best to all,

Petar