Each  '(' and ')' in an argument string such as in f('()(()()((((())))))))))))))') causes a blink.  Ditto with a comment withing the call.  A related bug is that any unquoted '(', as when one enters f((a+b)*c), dismisses the tip. 

Proposed partial solution: before displaying a tip, record the opening index (before the opening '(').  When there is an opening index, and '(' is keyed, ignore it; no parsing.  When the tip is closed (properly), removed the open index.  I believe paren matching would work properly.

The cause of blinks for ')' in strings and comments would need to be found and remedied.