My home alarm?

hello

For the last two days, my home alarm has been going off when I arrive home. I would like to know why this is happeneing. I see the alarm control box, all the zone light are not on but the temper light is on. I can reset but when leaving the house and turning the alarm on its ok, but when I come home later around two hours our more the alarm has gone off. the temper light is on. What would be the cause of this, would it be the battery needs to be replaced?
Thank you for your help.

Steve.