After we make sure there's no affection associated with physical link to NE80E router, we can check whether there's regular packet lost. For example, there's one drop when every about 150 packets pass. And the average ping latency time is also rather low. Then we should check whether the icmp self-protection is effective in NE80E. This mechanism can avoid overmany icmp packets to take on system resource to affect normally use.
Suggestion:If this situation happens, please slow down the ping frequency or reduce ping packets size.