on the blink

on the blink (not working properly) — амер. сленг 1) в плохом состоянии, не в порядке; 2) при последнем издыхании (Lingvo).

Example 1: My computer's on the blink again (LDOCE).

Example 2: Your link's on the blink (LDOCE).

Example 3: Your joke radar seems to be on the blink today (from a forum post).

also
[on the fritz]