There are many many problems,out of them the followings are important-
01. GSM problem (High or Low)
02. Shrinkage (Above limit)
03. Dia(less/More)
04. Spirality(High)
05. Softener Spot
06. Soda Spot
07. Yellow Spot
08. Band Mark or Band Line
09. Crease Mark
10. Neps
11. Hairiness
13. Dia Mark
14. Hole
15. Sinker Mark
16. Uneven or Patchy dyeing
17. Running Shade
18. Roll to roll shade variation
19. Bowing
20. Lycra Missing
21. Fabric Strength fall
22. Shade not matching with standard
23.ETC.
24. And finally not going delivery on-time to cutting for above mentioned reasons.