annoying issue with RDI

Hi Experts,

I have an annoying issue with RDI. (version 9.6.0.11).

While programming sometimes I got a load of errors in the left margine.
That sometimes can be two or three times a day, or 3 times in a minute.
The errors even appears on comment lines '// ---'. They can popup in every program and the errors are not related to the current source.

The only thing is close and reopen the source or cut and paste the complete source.

Errors look like e.g.

Multiple markers at this line
   - "select_kw" expected instead of this input
   - "set_descr" expected instead of this input
   - "resignal_kw" expected instead of this input
   - "begin_dyn_kw" expected instead of this input
   - "resignal_kw" expected instead of this input

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and 

"fetch_kw" is invalid

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and

Multiple markers at this line
   - "add_op" expected after this token
   - "intersect_kw" inserted to complete scope

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Where do these errors come from and how can I stop this behavior?

Thanks.