You might want to check your water pressure.I bought 5 Orbit hose water timers (one port and 2 ports) last year and now one is bad and another one starts to water randomly and no idea how long it will water and stop. It just completely flooded my lawn this morning!
This really sucks!
This one does look good and easy to operate.I use this one (cause I'm cheep)
https://www.lowes.com/pd/Orbit-1-Program-Digital-Hose-End-Timer/3030653
I have a couple, some with 2 way splitters attached.
Bought them 2 years ago and put in lithium batteries (not the rechargeable type) and they just keeps on running.
You did check the batteries in yours, right?
Pressure is just 65 psi.You might want to check your water pressure.