1e480021_iness___Local_Search___Part_15__Additional_details
[Date/Area Affected / Issue] 01/12/12 Places: When an owner response to a review exceeds 4094 characters Google responds with the meaningless error: Server error. Please try again later. [Reference URL] Blumenthal’s Blog Comment [Additional details] 
I tested this & verified exactly where the bad messaging occurs
Google Places (Maps & Local) | Understanding Google My Business & Local Search - Part 15
Additional details