DNS WAN test failed

i have the same problem…

what can i do

this is my event log:

ar 02 16:03:21 WAN: WAN 1 - PLDT Fiber disconnected (WAN failed DNS test)
Mar 02 16:02:56 WAN: WAN 1 - PLDT Fiber connected (192.168.1.3)
Mar 02 16:02:36 WAN: WAN 1 - PLDT Fiber disconnected (WAN failed DNS test)
Mar 02 16:02:11 WAN: WAN 1 - PLDT Fiber connected (192.168.1.3)
Mar 02 16:01:56 WAN: WAN 1 - PLDT Fiber disconnected (WAN failed DNS test)
Mar 02 16:01:30 WAN: WAN 1 - PLDT Fiber connected (192.168.1.3)
Mar 02 16:01:11 WAN: WAN 1 - PLDT Fiber disconnected (WAN failed DNS test)
Mar 02 16:00:46 WAN: WAN 1 - PLDT Fiber connected (192.168.1.3)
Mar 02 16:00:31 WAN: WAN 1 - PLDT Fiber disconnected (WAN failed DNS test)
Mar 02 15:59:46 WAN: WAN 1 - PLDT Fiber connected (192.168.1.3)
Mar 02 15:59:32 WAN: WAN 1 - PLDT Fiber disconnected (WAN failed DNS test)
Mar 02 15:59:06 WAN: WAN 1 - PLDT Fiber connected (192.168.1.3)
Mar 02 15:58:15 WAN: WAN 1 - PLDT Fiber disconnected (WAN failed DNS test)
Mar 02 15:57:30 WAN: WAN 1 - PLDT Fiber connected (192.168.1.3)
Mar 02 15:57:15 WAN: WAN 1 - PLDT Fiber disconnected (WAN failed DNS test)
Mar 02 15:56:50 WAN: WAN 1 - PLDT Fiber connected (192.168.1.3)
Mar 02 15:55:10 WAN: WAN 1 - PLDT Fiber disconnected (WAN failed DNS test)

and this is my device info

Model Peplink Balance One Core
Product Code BPL-ONE-CORE
Hardware Revision 1
Firmware 8.1.1 build 5040
PepVPN Version 9.1.0
Modem Support Version 1024 (Modem Support List)
Uptime 2 days 19 minutes
System Time