Advanced notice error

[Vivian956]

hi just wondering if anyone else is having a similar problem or has any ideas as to what may be happening. Everyday new advanced notice messages appear in calendar, with no booking. This started about 4 weeks ago. Also settings are being changed . We have been changing everything back to the way it should be and the next day it has been altered again.  Any ideas would be appreciated.

[Emiel1]

@Vivian956 

What do you mean by "advanced notices" ?

Can you give an example of such notice ?

Maybe check the login sessions in your account for access from unkown devices

(In other words: account hacked ? )