Loose Back to Wall Toilet Seat

Hello,
I'm looking for a bit of advice.
I have a back to wall toilet seat, which slowly works its way loose.
I know that I can take the seat off and pop the covers to tighten the screws, but after a while (small number of months) they work their way loose again. These are the connectors that came with the unit.
Does anyone know of a Is there some sort of tape / paste / a gadget / random obscure trick, that will allow me to secure it back up and have it stay in place?
Any ideas welcome and thanks in advance.
Jon.

 

Thanks for the info.
Perhaps your right. It may need something replacing.
They are new units (less than a year) but assuming it's like other things, the manufacturer supplied fixing aren't always the best.