Reported in https://lists.wikimedia.org/pipermail/wikidata/2018-November/012610.html
Requests like this consistently fail, take lots of time and return 0 results:
https://www.wikidata.org/w/api.php?action=query&format=json&continue=&list=recentchanges&rclimit=500&rcnamespace=0|2|4|6|10|14|120|122|828&rcprop=comment|flags|ids|loginfo|sizes|tags|timestamp|title|user|oresscores
Removing the oresscroes param makes the request respond quickly and with results:
https://www.wikidata.org/w/api.php?action=query&format=json&continue=&list=recentchanges&rclimit=500&rcnamespace=0|2|4|6|10|14|120|122|828&rcprop=comment|flags|ids|loginfo|sizes|tags|timestamp|title|user