I'm telling you, something is up with your exchange, rebooting your router is a temporary fix, don't change anything and test in a hour or two, I bet your traceroute shows high latency again.
Yip ... its fukt.
Microsoft Windows [Version 10.0.10240]
(c) 2015 Microsoft Corporation. All rights reserved.
C:\Users\Graham>TRACERT
WWW.GOOGLE.CO.ZA
Tracing route to
WWW.GOOGLE.CO.ZA [216.58.223.3]
over a maximum of 30 hops:
1 <1 ms <1 ms <1 ms 192.168.0.1
2 * * * Request timed out.
3 996 ms 962 ms 1068 ms 41.193.3.101
4 1004 ms 934 ms 919 ms 41.193.3.102
5 933 ms 1001 ms 1018 ms 196.41.12.0
6 822 ms 1054 ms 1122 ms 41.193.32.137
7 924 ms 953 ms 759 ms 41.193.32.198
8 1162 ms 1136 ms 969 ms 41.193.119.42
9 1031 ms 928 ms 1134 ms 72.14.220.136
10 275 ms 450 ms 487 ms 72.14.237.239
11 360 ms 416 ms 458 ms jnb01s07-in-f3.1e100.net [216.58.223.3]
Trace complete.
C:\Users\Graham>
Direct Afrihost Dialup
C:\Users\Graham>TRACERT
WWW.GOOGLE.CO.ZA
Tracing route to
WWW.GOOGLE.CO.ZA [216.58.223.3]
over a maximum of 30 hops:
1 * * * Request timed out.
2 971 ms 884 ms 954 ms dbn-up2.ip.adsl.co.za [169.1.5.162]
3 944 ms 838 ms 661 ms dbn-in1.ip.adsl.co.za [169.1.5.204]
4 879 ms 752 ms 888 ms 41.162.84.192
5 485 ms 537 ms 468 ms 172.18.1.162
6 219 ms 159 ms 136 ms 72.14.194.206
7 770 ms 728 ms 865 ms 72.14.237.239
8 738 ms 857 ms 1034 ms jnb01s07-in-f3.1e100.net [216.58.223.3]
Trace complete.
C:\Users\Graham>