Air leak and cannot find the problem pls help!!!

[Shaung14]

Hey all

My pool has an air leak while using the creep crawly. Bad suction and the creepy stops after a while, 5 minutes.
The issue is when I remove the weir box lid ( where you insert the creepy hose in the boxl there is absolutely no air leak in the system. No bubbles out the return jets, and perfect flow. I have checked all the inlet hoses by the pump , O-rings, seals, everything.
Please help with some suggestions of what I can look for and troubleshooting

[Denniswiseman]

Normally when vacuuming it puts an extra load on the suction and any minute leaks become more noticeable
The first and most obvious thing to do is silicone grease the pump basket lid "O" ring
Just looking at joints and "O" rings doesn't show any problem