I have an asrock h110 still running rock solid since many years. The only thing you should watch out every 6 months is dust formation that can shorten the hardware average life.
true some dust can cause micro shorts. so a good dusting every once in a while is in order.
I'd like to add this: an higher short risk is always caused by combined factors. Dust in a smaller degree isn't a problem, but little dust + high humidity can seriously hurt the boards very quickly.
yeah true. also the actual dust/dirt content can vary.
Our warehouse has a ton of diesel trucks go in and out. So we get a dark grime and regular dust. That grime is partially made of diesel fuel.
It is conductive. So we have a lot of filters and we do a deep clean 2x a year every board a 99% Alcohol bath 2 times a year.
We finally found a better filter which has cut the grime down a lot. Between the deep cleaning and the new filters the control boards all work a lot better.
I have not worked with ASICs, but with video cards, I prefer to blow through video cards and not tear them apart for no reason. But there are no diesel trucks near my farms.
If you are using a Linux system, then you are using the web interface and the Linux system uses several megabytes of video card memory. If you use windows, then one video card will use 100-200 megabytes of memory and this can affect the hashrate, as was the case with ethereum mining on 4 GB video cards. 
