The life of a reliever. 2 years ago he was moderately bad (and of course much worse than they expected), last year he had a 2.30 ERA for the season in 63 games and 34 saves, this year he has another bad (but not awful) ERA.
WHIP of 1.272 and only 2 HRs in 31 innings implies to me that his 4.99 ERA has some pretty significant bad luck involved in it. Sure enough his FIP is 2.55, but it has been consistently in that area and he has had 2 out of 3 seasons of 4+ ERAs. Bad luck, but I wonder if he also struggles with men on base (which is not accounted for in FIP, but of course shows up in ERA).