The worst part about JCE-miner for Vega rigs is that it is so stable - that I feel so bad to shut down 600 hours uptime rig just to update the miner version. JCE, we need hot swap updates! LOL! 
Could you tell us which amd driver, config, algo, and hashrate you have? I'm very curious because last time I tested JCE-miner, it was very unstable! So I'm still running SRBminer with 4 vega 56, and it's very stable so far!