Report Server ( [162] Internal request to deactivate schedule ) error ( SQL Server 2008 R2 )
Yes, that's correct, there was bug in earlier version saying 


  "If you set up a SQLAgent job to have a recurring weekly schedule, the
  job executes successfully the first day, but may later become disabled
  and the job may not run the next day and thereafter."


But later also, quite a few have reported and it worked for them once they upgraded to SP2+( Sql Server 2008R2), so depends what SP are you running as of now:

Also,

This error may occur if you have a duplicate schedule. Say for the job in question there are various steps and some steps may have the schedule with similar name , even though different timings, but still same name on schedule step also has witnessed the above error. See for any such miss.

Moreover, see here if this helps.