Hi smithy1928 and welcome to NeuroTalk
I have used Clonazepam for 14 years, sometimes on a relatively high daily dose and sometimes on an as needed basis (I currently am not using Clonazepam).
A few years ago I needed to have NeuroPsych testing done. The Dr. told me that Clonazepam can cause cognitive dysfunction. In my case Clonazepam was not the problem but something I needed to be aware of.
Are you on any other medications? Such as a cholesterol lowering medication? These have been known to cause cognitive dysfunction.
Best wishes on coming off of Clonazepam I have read it can be quite difficult. Please speak with your prescribing Dr. if needed. As has been mentioned slowly tapering down is very important.