Winbox problem conection

Good afternoon

I have winbox version 3.38. to connect to an rb1336. and it disconnects me from the session all the time. The CPU reaches a maximum of 6% and has disk space and memory. Any suggestions as to what the problem is. thanks for your help

In winbox, did you try with both mac and IP address ? Are you running default configuration ?

If you can access it via IP can you log into the router via webfig ?