42 minutes ago, xwiggen said:

The only other possible explanation I can think of not reaching NTP servers is that your ISP is blocking remote NTP servers (DDOS mitigation), that happens rarely, is easily checked by 'ntpdate -vd pool.ntp.org' (non privileged port, so not blocked), or even simpler, use your gateway ip as most routers broadcast it anyway.

destructor@orangepiplus:~$ sudo ntpdate -vd pool.ntp.org
26 May 16:09:51 ntpdate[17774]: ntpdate 4.2.8p12@1.3728-o (1)
Looking for host pool.ntp.org and service ntp
167.86.76.95 reversed to jonasled.de
jonasled.de forward check lookup fail: Unknown error
host found : 167.86.76.95 (jonasled.de)
transmit(167.86.76.95)
receive(167.86.76.95)
transmit(212.83.179.156)
receive(212.83.179.156)
transmit(185.244.195.159)
receive(185.244.195.159)
transmit(108.61.56.35)
receive(108.61.56.35)
transmit(167.86.76.95)
transmit(212.83.179.156)
receive(212.83.179.156)
transmit(185.244.195.159)
receive(185.244.195.159)
transmit(108.61.56.35)
receive(108.61.56.35)
transmit(167.86.76.95)
transmit(212.83.179.156)
transmit(185.244.195.159)
receive(185.244.195.159)
transmit(108.61.56.35)
receive(108.61.56.35)
transmit(167.86.76.95)
transmit(212.83.179.156)
transmit(185.244.195.159)
receive(185.244.195.159)
transmit(108.61.56.35)
receive(108.61.56.35)

server 167.86.76.95, port 123
stratum 2, precision -23, leap 00, trust 000
refid [237.17.204.95], root delay 0.013870, root dispersion 0.061859
transmitted 4, in filter 4
reference time:    e27bd9db.ec609209  Fri, May 29 2020 21:58:35.923
originate timestamp: e27be072.e319e100  Fri, May 29 2020 22:26:42.887
transmit timestamp:  e27793a5.b078107b  Tue, May 26 2020 16:09:57.689
filter delay:  0.07034  0.00000  0.00000  0.00000 
         0.00000  0.00000  0.00000  0.00000 
filter offset: 281811.1 0.000000 0.000000 0.000000
         0.000000 0.000000 0.000000 0.000000
delay 0.07034, dispersion 56.00000
offset 281811.175392

server 212.83.179.156, port 123
stratum 2, precision -24, leap 00, trust 000
refid [35.192.231.136], root delay 0.008606, root dispersion 0.047073
transmitted 4, in filter 4
reference time:    e27bd87d.a9d9bf50  Fri, May 29 2020 21:52:45.663
originate timestamp: e27be075.173b62e5  Fri, May 29 2020 22:26:45.090
transmit timestamp:  e27793a5.e3aca77e  Tue, May 26 2020 16:09:57.889
filter delay:  0.07707  0.07664  0.00000  0.00000 
         0.00000  0.00000  0.00000  0.00000 
filter offset: 281811.1 281811.1 0.000000 0.000000
         0.000000 0.000000 0.000000 0.000000
delay 0.07664, dispersion 24.00000
offset 281811.175878

server 185.244.195.159, port 123
stratum 3, precision -25, leap 00, trust 000
refid [80.237.128.149], root delay 0.022736, root dispersion 0.025070
transmitted 4, in filter 4
reference time:    e27bde3d.b21e1ba7  Fri, May 29 2020 22:17:17.695
originate timestamp: e27be079.4937a2cc  Fri, May 29 2020 22:26:49.286
transmit timestamp:  e27793a6.16dd6640  Tue, May 26 2020 16:09:58.089
filter delay:  0.06255  0.06229  0.06241  0.06226 
         0.00000  0.00000  0.00000  0.00000 
filter offset: 281811.1 281811.1 281811.1 281811.1
         0.000000 0.000000 0.000000 0.000000
delay 0.06226, dispersion 0.00000
offset 281811.178343

server 108.61.56.35, port 123
stratum 2, precision -22, leap 00, trust 000
refid [198.30.92.2], root delay 0.023178, root dispersion 0.021896
transmitted 4, in filter 4
reference time:    e27bdefd.9d69293c  Fri, May 29 2020 22:20:29.614
originate timestamp: e27be079.89bbf28f  Fri, May 29 2020 22:26:49.538
transmit timestamp:  e27793a6.4a10719b  Tue, May 26 2020 16:09:58.289
filter delay:  0.16010  0.15996  0.15985  0.15987 
         0.00000  0.00000  0.00000  0.00000 
filter offset: 281811.1 281811.1 281811.1 281811.1
         0.000000 0.000000 0.000000 0.000000
delay 0.15985, dispersion 0.00000
offset 281811.181579

26 May 16:09:59 ntpdate[17774]: step time server 167.86.76.95 offset 281811.175392 sec
destructor@orangepiplus:~$ 
 

I've done armbianmonitor -U and got this output, maybe it help to resolve my problem
https://www.dropbox.com/s/49m3f7w6h2lfujf/armbianmonitor.txt?dl=0

I've reinstalled chrony and problem went away! Thank all for attention