kp4md

I recently had a similar problem on my KiwiSDR that runs with WsprDaemon.
About 22:50 UTC on 5 July I checked and saw that WsprDaemon had stopped uploading WSPR spots since 16:44 (six hours earlier) that day.
The Kiwi web interface reported that all 8 user channels were busy, but the Status tab in the Admin panel reported the one public user channel was available.
The Kiwi Server Log showed multiple connection attempts from 161.117.57.140 being repeatedly kicked off due to exceeding the connection limit.
The router connection log showed an attack of rapid, multiple connections from that same IP with different port numbers.
I rebooted the KiwiSDR and then caught 161.117.57.140 logged on using the iq display extension as "Tavistock" on the public user channel. 

RX0: "wsprdaemon_v2.9g" (192.168.0.120, unknown location) 28126.10 kHz usb z0 0:06:01
RX1: "Tavistock" (161.117.57.140, Tavistock) 13215.00 kHz usb z14 iq_display 0:05:39
RX2: "wsprdaemon_v2.9g" (192.168.0.120, unknown location) 10140.20 kHz usb z0 0:06:01
RX3: "wsprdaemon_v2.9g" (192.168.0.120, unknown location) 21096.10 kHz usb z0 0:06:02
RX4: "wsprdaemon_v2.9g" (192.168.0.120, unknown location) 3570.10 kHz usb z0 0:06:09
RX5: "wsprdaemon_v2.9g" (192.168.0.120, unknown location) 7040.10 kHz usb z0 0:06:14
RX6: "wsprdaemon_v2.9g" (192.168.0.120, unknown location) 18106.10 kHz usb z0 0:06:08
RX7: "wsprdaemon_v2.9g" (192.168.0.120, unknown location) 14097.10 kHz usb z0 0:06:14

A web search identified the IP address 161.117.57.140 registered to Alibaba, Inc. as the Asia Pacific Network Information Center in Hangzhou, China and 13215 kHz is a United States Air Force ALE frequency.
The Raspberry PI's internet connectivity and time clock setting had apparently been disrupted while an entity in China under the alias "Tavistock" used the KiwiSDR to monitor US military comms.
Since then I have closed public access to my KiwiSDR.  I am aware that governments use web resources to gather foreign military intelligence, but I object to my equipment being used in that manner.