Battery anxiety. Low-battery warnings ignored for a week end in a door that will not open electronically.
Connectivity. Wi-Fi, Bluetooth or hub problems leave the lock unreachable from the app.
App and account changes. Manufacturers update apps, change features, add subscriptions or discontinue products. A lock that depended on a service can lose functions it used to have.
Cold weather. Motors and batteries struggle in the cold, and some locks become slow or unreliable in a GTA winter.
Household fit. An older parent, a child or a tenant who finds the lock confusing, or prefers a key.
Reliability. A lock that has failed once, especially with someone locked out, loses the household's trust. When that happens, the steps are the ones for a smart lock that stopped working.