So I am currently in the process of building a gaming pc.I know all the parts I need except for the motherboard.I'm currently debating between the MB MSI B360M BAZOOKA and the MB Gigabyte Z370M-DS3H.The bazooka offers good performance boosting for the cpu and ram and is generally a good motherboard for the gaming experiance but on the other hand the z370m has sulfurization protection and has dual bios (both are good things because I plan to use this pc for more than 4 years)so I have two questions towards the comunity:
1:what are the degradation issues or issues in general that most if not all motherboards face over a long period of time?
2:What motherboard should I pick between the two?which one offers me the best protection again's the biggest threats a motherboard faces over time and which one will last longer?. without starting a fanboy war, I'll just state that the only problems I've ever had with mobos degrading was with voltage supply (under and over) and the capacitors bulging and leaking, but with the new solid ones, those days are long gone.
all things being equal - the chances of either of those brands lasting for 4 years would be the same.
I agree with Mark additionally how many years of use do you expect to get out of a gaming build before buying a new motherboard? ( 4 years is likely no problem as long as not playing around with voltages and overclocking etc and once built hands off the internals with exception to occasional removal of dust with canned air from INSIDE case and power supply.) **Additionally have a battery backup that is rated heavy enough to carry the computer for a good 10 minutes or longer to avoid power outages and brown outs and power spikes from hitting it and damaging it. I run all my desktop builds through APC brand Battery Backups aka UPS's.

Most people getting 5 years is a good run for a motherboard and then moving on to something better if your constantly buying new game titles that require more and more processing power and video rendering power.

My brother buys/builds a new gaming system every 3 years and I buy his old gaming systems or parts from them as a cheap upgrade path because I don't need the latest and greatest and that Geforce GTX 780ti 3GB for $100.00 is plenty for me as I bought that 2 years ago used from him when he upgraded to a stronger GPU processing power video card.

I stretch the life of builds as far as I can go. And have multiple computers paired with games of their era. My oldest computer being a Pentium 4 from 2002, which cant run most modern games, but works great for older titles that act up on newer video cards etc. Some builds I overclock to try to get 10% more processing power out of to meet requirements of being greater than 2.5Ghz CPU clock bringing a 2.3Ghz to 2.53Ghz etc. Generally I don't buy motherboards that I get the most powerful CPU for them because I like to buy just enough to get by now and then buy that best CPU for the build later used at a savings when the additional processing power is needed. I have bought mainly AMD CPU builds for longer upgrade paths of the AM2+ and AM3+ motherboards etc. However when I built my gaming system with AMD FX-8350 4Ghz 8-core, the socket AM3+ motherboard only supports up to this CPU so its maxed out at the get go and there is no CPU upgrade path for that latest gaming build. If I went with a more costly motherboard however I could have had more of an upgrade path but I figured by the time that system becomes not enough for me, I will just replace the CPU, RAM, Motherboard and build something even better or just leave that system complete and build a new gaming system with all new parts. The 8-core has been more processing than I ever needed. I haven't run it in 3 months as for the 19 watt system I use with a A8-5545m 1.7Ghz with 2.7Ghz Turbo Quadcore APU plays just about all the games I play and doesn't rack up the electric bill that the power hungry FX-8350 does. The A8-5545m build has no upgrade path other than replacement of motherboard if more CPU processing power is needed. I got the APU Combo Desktop Motherboard with Laptop APU for $60 and used parts from other computers to build it. If it LASTS 3 years I will be happy at a cost of $20 a year + electricity to full depreciation. Additionally I am ok with 30fps in games whereas some people cant stand that low of a frame rate. 
I would think sunstroke would be the main culprit...