i'd say keep at it. Maybe because you've done them for so long you're starting to lose interest? Maybe you're not paying 100% attention to these checks and they're just becoming a routine which your mind doesn't see as important when it enters rest?

I'm no expert but I'd definitely recommend really concentrating during checks and definitely increasing awareness as ClouD said. When you're doing your checks, make a big attempt at awareness each time. Look around, observe everything that's about and really push yourself to focus each time on the reality checks. If I was in your position I'd probably end up not paying a lot of attention to the checks (which kinda ruins their whole usefulness).

Hopefully that helps! LDing isn't easy... I stopped trying for a bit and now I haven't had one for quite a while. It takes a lot of focus and practice...

Good luck!