Are there any solutions to the 4 line limit on GRID EDIT data entry?

Sort of.  First of all for every line that you manually enter you get an extra line, so they actually never run out.

But if you hung up on copy and paste, yes, that can be a problem as if you paste 5 line sinto the 4 rows, you only get the first 4 lines pasted.

What I do it to highlight the last 4 rows by SHIFT-touching the extreme left side.  Then use the right click to add rows,  you will get 4 extra rows.
The do that again highlighting 8 rows and you get another 8.  So now you have 16.

Repeat and you get 32 rows,  a few more times are you are just drowning in rows.  I add enough so I'm sure my paste will fit and not get truncated.

As you add more data on the lines, it should dynamically load an extra line for you.

Sometimes older browsers (Explorer) struggle with these reactive pages.  What browser are you using?