I am having a strange problem that seems to happen about every day now. While using my iMac (wireless keyboard) and doing a search on say google or yelp, after I type the first letter the cursor will not move forward with the next letter. Rather it just replaces the first letter with each consecutive letter I type. The only way to get it to stop would be to click an item somewhere on the search engine. I can then go back and actually spell out the word/s in the search engine box with no problem until the next time it happens. I hope my description makes sense and if anyone has experienced this can share what might be causing this, I would appreciate it. Thank you!