Has anyone ever had a canister filter start leaking from the seam just below where the top attaches? This is not where the pump attaches to the canister, but below that where the top frame meats the plastic. It's dripping steadily, but on just the one side. The filter itself is a few years old, but it's never been dropped or damaged. I'm just wondering if there is a seal inside that might be worn and if this is something that can be fixed with some sealant.