Both too fast and too slow at the same time?

[Man-Grove]

Had some stutters I never had before, now feeding Snapcast with Mopidy + gstreamer. Doesn't matter if I used 0.25 or 0.27, problem is the same. It might have stabilized now but:

jul 18 15:25:16 debian11 snapserver[4046]: next read < 0 (Mopidy): -16.169 ms
jul 18 15:25:16 debian11 snapserver[4046]: Too many frames available, fast forw>
jul 18 15:25:16 debian11 snapserver[4046]: next read < 0 (Mopidy): -36.007 ms
jul 18 15:25:16 debian11 snapserver[4046]: Not enough data available: 32 ms, mi>
jul 18 15:25:16 debian11 snapserver[4046]: onResync (Mopidy): 64 ms
jul 18 15:25:16 debian11 snapserver[4046]:
jul 18 15:25:16 debian11 snapserver[4046]: next read < 0 (Mopidy): -16.005 ms
jul 18 15:25:17 debian11 snapserver[4046]: next read < 0 (Mopidy): -3.922 ms

Pausing and playing again sometimes fixed the issue, which indicates that it's a Mopidy problem, but it's weird that "too many frames" and "not enough data available" is logged at the same time. I tried upping the chunking to 64ms and the buffer to 1500ms, changed to pcm and back and tried fifo/tcp/alsa sinks between mopidy and snapserver. Currently it seems to be working again -- dunno why -- but has anyone seen something similar?