Microfilters, are they robustly built? or age fast(speed drop!)

I am not an electronics person but I'd like somebody to do a test of random Microfilters
and tell me if the Unit if shaken about does the Performance drop? That is my conclusion after fitting Several Microfilters of various age some Rarely moved and Other which take the Odd knock Hence the performance drops slightly say several MBps!

They Visually they look intact /clean body,Phone is clear ..No crosstalk heard(ear full of computer noise >high frequency "squealing" Like the Dialup Modems......But If you benchmark these on Speedtest The returned speed values can be Shocking on the same piece of cable
Mine if I trade the 2 current microfilters 1 is only 6 months old and the other is perhaps several years old (Ex BT)
Will give a "High of 3.8 to 3.9(on a good day and swapped over (as of posting time The numbers Are 2.6MBps to 3MBps tops Can barely stream video at that level!:(
For the record swapping router makes no difference
Did have a High of better Than 5.5 MBps for a year or 2 but then the speed has been slowly ebbing away ..

I think I Have blamed everything except the Microfilter robustness quality for my speed drop Threads over the last few years:o
Will purchase another brand new filter shortly and insert that into my network
(quite cheap) to confirm the connection is poor or It lights up once more to 4 or even 5+ MBps

Late information which confirms my suspicion from the DSL Filter Wiki http://ift.tt/1PjVh4L

Quote:

DSL filters that are cheaply made are prone to fail[1] and therefore filters are a very common cause of problems on DSL connections. Internet service providers like AOL recommend changing the filters before they reach a year of service.[2] Other ISPs recommend changing filters after six months[3] or one and a half years.[4] These filters do not 'clog up', but they may fail due to faulty capacitors.[5] Some filters instruct the user on their package to change them after six months of use.[6] The usual symptom of a failed filter is frequent DSL disconnects or slow internet speed, and the usual procedure to test for failed filters is to remove all filters from the telephone line leaving only the router and checking to see whether the DSL speed increased.

All Wiki News references links are relevant on this (Neglected subject) OK?

I Think we all want New replacement filters

Microfilters, are they robustly built? or age fast(speed drop!)