I don't think it's a problem but just like Trip A odometer go as far as reaching it's maximum range .So, the issue is that Trip A automatically resets itself every 1250 miles . However I know it would go much higher miles .
Anyone else experienced the same thing or what do you recommend to stop this automatic reset ?

Maybe that's as far as it goes? Mine only goes to 999.9

I guess yours has 3 digits whereas mine has 4 .I assume it should hit 9999.9.However I am not expert just some prediction goes here

Mine also resets itself after 999.9 miles. Kind of an annoyance for thos 1,000+ mile road trips. :D

I agree, it is an annoyance. I keep track of my oil consumption the the Trip B and it's pretty easy to forget how many thousands it was.