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numbers I block from calling keeps getting erased

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numbers I block from calling keeps getting erased

Around the end of May, I had some problems that I believe were due to an upgrade to the modem.  One of those problems was that all of the numbers I had blocked were wiped out and I had to start all over again blocking telemarketers as I recieved calls.  Now today I go to add a number and all the numbers were gone AGAIN!  What is going on? I'm getting a little fed up with Comcast. Our internet is so slow that streaming shows from Netflix is a nightmare, I can no longer dial out on my rotary phone thanks to the "upgrade", and now this.