Loop, Read stops after one record with GUI (doesn't loop)

Loop, Read stops after one record with GUI (doesn't loop)

I have a script for entering records in our system that was originally
working fine with a MsgBox, but I added a GUI to show the record entry.
Now the script stops after the first record.
In the example below I've stripped out all of the actions and record lines
to help make this easier to parse, but I've kept in all the important
stuff and tested this version of the script.
Loop, read, C:\_AutoHotKey\AA_test.txt
{
StringSplit, LineArray, A_LoopReadLine, %A_Tab%
aaduedate := LineArray1
aauniqueid := LineArray2
aaprefix := LineArray3
aasequence := LineArray4
aadescript := LineArray5
aaelig := LineArray6
;-------------------------------------------------------------------------------------
;Use these to test the file match in the Input File.
;Remove surrounding comments and surround the rest of the script up to the
last brace.
SendInput, Prefix: %aaprefix% {enter}
SendInput, Sequence: %aasequence% {enter}
SendInput, Description: %aadescript% {enter}
SendInput, Eligibility: %aaelig% {enter}
SendInput, ID Card: %aaidcard% {enter}
;---------------------------------------------------------------------------------------
;Pop-up validation menu
Gui, Add, Button, x22 y380 w100 h30 , &Submit
Gui, Add, Button, x362 y380 w100 h30 , &Cancel
Gui, Font, S14 CDefault, Verdana
Gui, Add, Text, x152 y10 w210 h30 +Center, Is the entry correct?
Gui, Font, S10 CDefault, Verdana
Gui, Add, Text, x102 y40 w90 h20 , %aaprefix%
Gui, Add, Text, x102 y70 w130 h20 , %aaelig%
Gui, Add, Text, x312 y70 w30 h20 , %aadescript%
Gui, Add, Text, x432 y70 w30 h20 , %aaidcard%
Gui, Font, S8 CDefault, Verdana
Gui, Add, Text, x132 y380 w230 h40 +Center, Click Submit/press S to
continue. Click cancel to stop script.
; Generated using SmartGUI Creator 4.0
Gui, Show, x9 y250 h428 w480, Auto Action Validation
Return
ButtonCancel:
ExitApp
ButtonSubmit:
Gui, Submit ;
MouseMove, 630,55
Sleep, 100
SendInput, {Click 630,55}
SendInput ^S
Return
}
The buttons do work and clicking Submit will send the MouseMove and
SendInput. But after that it just stops and doesn't load the next record
in the text file.
Thanks in advance!