WAP as Repeater UNSTABLE

Hi to all.

Ive been using mi RB951Ui-2HnD in Home AP (6.47.1) without problems, like 5 years.

Recently I’ve decided to connect a new RBwAP2nD in repeater mode to improve signal in backyard, wirelessly. using the setup repeater seems to work in first instance, but approximately 10 minutes later the connection turns unstable, drops, disconnection, DHCP request (from WAP), can’t access via web, neither Winbox (if possible, only for a moment the disconnected). Reset the WAP like 5 times in different places, even side to side with the RB951Ui-2HnD with negative results.

Is there a special config for the AP (RB951Ui-2HnD) that maybe im missing? he’s working as DHCP and DNS (cache), load CPU=6% aprox, load memory=20% aprox, on logs every 3 minutes DHCP request, and data droped. On WAP RBwAP2nD cpu=4%, mem=80% (!), on WAP lots of deauth, lost connection messages on log.

Any help will be appreciated.
Thanks.