【求助】AR4031B Diagnose問題

AR4031B作完Diagnose, 理論上應該四項測試都顯示綠色的PASS, 可是我有時候(還滿常的)會看到變成上面兩項PASS下面兩項FAIL, 像下面這樣:

Test the connection to your local network
Test your Ethernet Connection: PASS Help

Test the connection to your DSL service provider
Test ADSL Synchronization: PASS Help
Test ATM OAM F5 segment ping: FAIL Help
Test ATM OAM F5 end-to-end ping: FAIL Help

一部分時候這樣子連線會正常, 一部分時候就會出現怎麼連都很慢, 感覺很奇怪.
從Help裡面看是顯示說
Fail:
Indicates that the DSL modem may not be able to communicate with the DSL provider network. This test may have an effect on your Internet connectivity. Occasionally the DSL provider network may intentionally block this traffic. Therefore if this test fails but you are still able to access the Internet, there is no need to troubleshoot this issue.
這個和Traffic有關嗎, 如果是被block, 那為啥有時會有時不會, 總不能給我 block 好玩爽快的, 像這樣報修也沒啥用, 感覺像是機房動手腳?

打去報修吧，應該是機房那出問題

報修過, 客服人員嘴上都客客氣氣, 現場來修時隨便看看就走了, 而且神奇的是當有人來維修時剛剛好燈號就回復正常, 等到過幾天或許就又變成上面說的情形, 嚴重懷疑是機房人員亂改設定或是換port應付某A就倒楣到某B之類的鳥事, 偏偏這種事又難追查, 沒有認識機房的人幫忙.

最近又還算可正常使用, 暫時懶得報修, 還要在家等人來, 想說先問問看有沒有人知道一些技術detail, 下次客服和機房擺爛我可以直接修理下去.

之前還有過說斷線打電話給客服, 結果客服回答我要讓小烏龜關機休息休息之類的回應, 我就做實驗, 偏不關烏龜給他繼續抓訊號, 結果最後還不是又回復了, 這要說不是機房問題還真難說得過去.