R7000 time synch repeating often all of a sudden?

JamesGL, looks like it isn't the ISP's modem.

I called the ISP and the first thing they did was REBOOT it (and I did the router). Didn't fix it. Next call I was told to RESET the modem to the shipped state. Didn't fix it, and actually unbeknownst to me, unbridged the modem. Next call the ISP bridged and rebooted the modem, didn't fix it.

So yesterday the ISP replaced the Ubee with an Arris modem. Not fixed either, still happening! Arris Log...

Not as often, but it does happen  almost every hour when it does as you can see above. Router log is comparable (I can't see more of the Arris log):

[Time synchronized with NTP server] Sunday, Nov 26,2017 04:09:20
[Time synchronized with NTP server] Sunday, Nov 26,2017 02:44:47
[Time synchronized with NTP server] Sunday, Nov 26,2017 01:16:25
[Time synchronized with NTP server] Saturday, Nov 25,2017 23:52:25
[Time synchronized with NTP server] Saturday, Nov 25,2017 22:23:25
[Time synchronized with NTP server] Saturday, Nov 25,2017 21:00:08
[Time synchronized with NTP server] Saturday, Nov 25,2017 19:30:19

At this point I do SUSPECT the router! I do get e-mailed the daily logs and keep them. On 11/15 it started to appear in the logs (1 PM).

[Time synchronized with NTP server] Wednesday, Nov 15,2017 06:15:02
[Internet connected] IP address: 67.x.x.x, Wednesday, Nov 15,2017 06:15:02
[DHCP IP: (192.168.1.30)] to MAC address F8:B1:56:DD:6A:xx, Wednesday, Nov 15,2017 05:23:31
[Time synchronized with NTP server] Wednesday, Nov 15,2017 04:30:02
[Internet connected] IP address: 67.x.x.x, Wednesday, Nov 15,2017 04:30:01
[Time synchronized with NTP server] Wednesday, Nov 15,2017 02:45:01
[Internet connected] IP address: 67.x.x.x, Wednesday, Nov 15,2017 02:45:01
[DHCP IP: (192.168.1.2)] to MAC address 98:01:A7:05:5D:xx, Wednesday, Nov 15,2017 02:13:33
[DHCP IP: (192.168.1.4)] to MAC address 84:89:AD:71:97:xx, Wednesday, Nov 15,2017 02:12:20
[Time synchronized with NTP server] Wednesday, Nov 15,2017 01:00:01
[Internet connected] IP address: 67.x.x.x, Wednesday, Nov 15,2017 01:00:00
[DHCP IP: (192.168.1.3)] to MAC address 10:AE:60:57:25:xx, Tuesday, Nov 14,2017 21:12:57
[DHCP IP: (192.168.1.5)] to MAC address AC:63:BE:8E:E3:xx, Tuesday, Nov 14,2017 20:00:41
[DHCP IP: (192.168.1.30)] to MAC address F8:B1:56:DD:6A:xx, Tuesday, Nov 14,2017 18:10:59
[DHCP IP: (192.168.1.30)] to MAC address F8:B1:56:DD:6A:xx, Tuesday, Nov 14,2017 15:05:15
[DHCP IP: (192.168.1.35)] to MAC address 68:5D:43:23:9E:xx, Tuesday, Nov 14,2017 14:03:16
[DHCP IP: (192.168.1.4)] to MAC address 84:89:AD:71:97:xx, Tuesday, Nov 14,2017 14:02:31
[DHCP IP: (192.168.1.2)] to MAC address 98:01:A7:05:5D:xx, Tuesday, Nov 14,2017 14:01:12
[DHCP IP: (192.168.1.3)] to MAC address 10:AE:60:57:25:xx, Tuesday, Nov 14,2017 09:41:45
[DHCP IP: (192.168.1.5)] to MAC address AC:63:BE:8E:E3:xx, Tuesday, Nov 14,2017 08:00:41
[email sent to: ixxx@x.com] Tuesday, Nov 14,2017 07:01:03

That is the entire log I got for that day, after that, every day I've been getting those Time synch's every 2 hours or less.  Before that it was once or twice a day, at least 15 hours apart but never the same amount, and never more than 23 hours?

I might go back in F/W but I'm not even sure that will fix it if something within the router has failed? I find my Wireless now is varying in speed of connection. Download can change on me, but the lowest if 40+Mbps on 100Mbps service which is fast enough anyway. At time it is 114Mbps which is 'normal' on the wired PC. However that test using OOKLA does seem to be possibly Server caused. Depend which Server it uses the results appear to be the same as the other tests at that server, so that could be server related but I didn't recall that happening before either?

When the ISP Tech was here he tested my cable line and it was fine...

Right now I don't know 'who' is initiating the time request? Assuming both the modem and router did get the same time (I can't see the time on the modem) there appears to be a slight delay when the Router logs the time change?  Still, it is possible the router initiates the request, the modem goes to get the time and logs it, sends the time to the router which then logs it? If correct, the router is doing the request, not the modem.