I have an unreliable WAN link that drops out for ~15 a couple times a day. All my GRE tunnels drop at once causing a hard outage, shown in the log as new adjacency due to expired hold-timer. I increased the hello-interval and hold-timers and things are very stable. Is there a disadvantage to increasing the hello-interval and hold-timer?
ip hello-interval eigrp 10 60
ip hold-timer eigrp 10 180