Since approximately last week (12/06/2017) I found the Pulseaudio output of my
BT headset to be skipping constantly. Nothing in the setup has changed since
then: what I notice from the journalctl output is that PA keeps on skipping
data even if no audio is going through the headset:

giu 19 07:25:51 leon.lan pulseaudio[2297]: [bluetooth] module-bluez5-device.c:
Skipping 32073 us (= 5656 bytes) in audio stream
giu 19 07:25:51 leon.lan pulseaudio[2297]: [bluetooth] module-bluez5-device.c:
Skipping 12095 us (= 2132 bytes) in audio stream
giu 19 07:25:51 leon.lan pulseaudio[2297]: [bluetooth] module-bluez5-device.c:
Skipping 11073 us (= 1952 bytes) in audio stream
giu 19 07:25:51 leon.lan pulseaudio[2297]: [bluetooth] module-bluez5-device.c:
Skipping 13079 us (= 2304 bytes) in audio stream
giu 19 07:25:51 leon.lan pulseaudio[2297]: [bluetooth] module-bluez5-device.c:
Skipping 12095 us (= 2132 bytes) in audio stream
giu 19 07:25:51 leon.lan pulseaudio[2297]: [bluetooth] module-bluez5-device.c:
Skipping 13072 us (= 2304 bytes) in audio stream
giu 19 07:25:51 leon.lan pulseaudio[2297]: [bluetooth] module-bluez5-device.c:
Skipping 9063 us (= 1596 bytes) in audio stream
giu 19 07:25:51 leon.lan pulseaudio[2297]: [bluetooth] module-bluez5-device.c:
Skipping 7100 us (= 1252 bytes) in audio stream
giu 19 07:25:51 leon.lan pulseaudio[2297]: [bluetooth] module-bluez5-device.c:
Skipping 8079 us (= 1424 bytes) in audio stream
giu 19 07:25:51 leon.lan pulseaudio[2297]: [bluetooth] module-bluez5-device.c:
Skipping 11094 us (= 1956 bytes) in audio stream

This has a "cyclic" pattern, that is, the skips occur approximately every 10
seconds. I wasn't, at first glance, able to identify what would occur every 10
seconds.