Why does my robot vac keep going into standby mode?

I keep finding my vac in something called standby mode with the battery draining, even though the vac is on the charger with the metal charging connectors physically touching. Why does this happen and how can I fix it so that it doesn’t?

Try cleaning the contacts with isopropyl alcohol. I had a lot more issues with this until I found a cure for the crazy static build-up this unit has as it would get a lot of hair/dust build-up on the contacts and on the charger base itself.