Samsung clock and timer app

[mreeveshp]

I use the stock clock app for alarms and stopwatch but lately I've been having to use it for the timer and I might have 1-4 timer set. I noticed earlier this week that one I set for 4 hours, when I looked to see how much time was left after a few hours it had only gone down 13 minutes. Sometimes it works fine even running multiple timers and sometimes it's barely counting down when I check it.

Has anyone had this problem and maybe know what might be causing it, or maybe know a better app for running timers?