Losing suction with Penimaster Pro

Using Penimaster Pro for few months now. Recently I have upgraded from Cream coloured sluice to Blue. Did this as this was more comfortable and lasts longer without having to remove it frequently. Noted however that I’m losing suction frequently, usually around 5 minutes mark, so rapidly that the glans comes out. Did use the split adapter. Still losing suction. Never had this problem with cream coloured sluice.

Any alternative apart from going back to Cream coloured sluice?