i have form content repeat data 900 records.. than at insert multiple data it work till item recordcount 333.. when i do item 334 the items will not be inserted at insertMultipleRecords
You would have to edit the code slightly by hand to do that, but it is certainly possible. If you attach your page I can take a look and suggest the line to change. 
i found out the following:
i told you at record count it stops inserting.. also if only one item is selected after number 333
Now i worked today at it and found out the folowing.
today i made an extra input field ( 4th) and after that the inserted stopped at 250..
So item 249 is being inserted , item 250 not.
maybe sowhere there is a limit 999/3 = 333 999/4 = 250
I attached txt file with the pagecode


