You need to be aware that with ping and tracert utilities that some nodes/hops are set to never respond to these packets, i.e. it is not definities proof of a problem getting 100% packet loss from a node.
If it was 1% to 99% then it would be more reflective of a real problem.
Thanks for this info Saffron. I've done a few tests on pingtest.net the past week and its results have always shown 0% packet loss. Is pingtest.net a reliable tester ?