HI, my 2844-222 can only sense about 2-3 meters distance. The document said it can reach 40feet. 

Does anyone have the same issue?

thanks

And my old MS 2842-222 can sense about 10 meters. 

Have you checked the dip switch for sensitivity?

https://cache.insteon.com/documentation/2842-222-en.pdf

Jumper 1 – Sensitivity To reduce sensor’s detection range by approximately 33%, use needle-nose pliers to carefully remove Jumper 1 (the left-most jumper) from the single pin it is installed on and reinstall it on both pins. Tap the set button once, wait 10 seconds and activate motion to establish the new setting.

Mine are motion sensor II

1 hour ago, jzh said:

Mine are motion sensor II

You listed both so it's a bit confusing in the morning before a pot of coffee.