A:AnswerAs with anything mechanical, the switches may breakdown after use.
I have an old Razer keyboard, probably about 5 years old now, every key works fine, the letters are worn out on the heavy use keys but other than that I've not had issues.
A:AnswerIf you have a second keyboard, you can use that as a primary keyboard, and use the damaged one for specific hot keys, I have a Blackwidow V3 that I use for my stream hot keys and for discord
A:AnswerI've been to several locations recently and every store I've been too has had them in stock. so really it all depends on where you're located and how popular razer products sell in your area.