Have you tried using the different routes, or clearing settings (if you've used it quite a bit)? I use WTFast in australia and it helps quite a lot in my experience, but sometimes I need to clear settings, or select a different country at a busy time of the day. I normally set it to just "Select Optimal wtfast Server 1" (automatic selection), but sometimes I specifically select Japan for a stable connection when it's otherwise unstable, because that's my datacenter location anyway. It can help with resolving data loss and spike issues. Sometimes just disconnecting WTFast and connecting again helps. I select connect during character selection