That's normal.

Wireless computers are
Heavier than wired
bigger than wired
cost more than wired
Use more batteries than wired
use the batteries faster than wired
Work worse than wired. All kinds of things can cause interference.
I've had two just die completely after a year, and after a couple of years.
I have a working cheap wired that I bought in 1994 or 95. I'm running six wired on different bikes one with 9,550 miles and a couple over 6,000. A couple over 3,000.

Are you seeing a trend?