Could also be related given the time and location.
M1196/18 - TEMPORARY RESTRICTED AREA EHTRA83 (GINKEL) ACTIVATED. AREA
PROHIBITED. GND - 3000FT AMSL, DAILY 1215-1400, 05 JUN 12:15 2018 UNTIL 06 JUN
14:00 2018. CREATED: 14 MAY 10:04 2018
Based on NOTAM's the following areas are reserved.
28-May Leusderheide CRAYEL
29-May Leusderheide CRAYEL
30-May Leusderheide CRAYEL
31-May STROE Zoersel Gilze Rijen (local demo)
1-Jun STROE Zoersel
4-Jun STROE Zoersel
5-Jun Ginkel Ursel
6-Jun Ginkel Ursel
Based on the info mentioned in the first message of this topic, no NOTAM found (yet) for locations: Kruispeel; Weerterheide, Leopoldsburg.
So it could be three locations reserved every day.