When contacts, including reed switches, normal switches, relays, etc, get stuck, it usually is because of sparks due to voltage spikes that weld the contacts to

When contacts, including reed switches, normal switches, relays, etc, get stuck, it usually is because of sparks due to voltage spikes that weld the contacts together. this happens when contacts are used with high currents/voltages and/or inductive loads, and can be avoided using so called snubber networks. https://en.wikipedia.org/wiki/Snubber https://en.wikipedia.org/wiki/Snubber