Hi,
I don't know your radio so I don't know if the volume control would be a rotary encoder type (usually identified by just a number stamped on it) or a potentiometer, usually identified by a number with either a k or k Ohms after the number denoting x thousands of Ohms resistance stamped on it).
If it is a rotary encoder try cleaning it and see if that resolves the problem.
Here is a link to a video that shows in principle, what to do.
Here is a link to the ifixit Grace Digital Mondo guide which may be of some help to gain access to the encoder.
If it is a faulty potentiometer (or even an encoder that has failed mechanically) hopefully there will be information stamped on the case of the component which will help if you have to order a replacement part, as I cannot find a service manual for the radio online from which to get the part information.
Hopefully this is of some help.
crwdns2934105:0crwdne2934105:0
crwdns2934113:0crwdne2934113:0
crwdns2915270:0crwdne2915270:0
crwdns2889612:0crwdne2889612:0
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crwdns2944067:03crwdne2944067:0
Had the same problem. Grace contacted me and said they could find a problem. When I receive it and if the problem occurs I will video tape and send it back. Cost me 35.00 to send it to them.
crwdns2934271:0crwdnd2934271:0 detectorist crwdne2934271:0
Well guys, I ended up just living with the crippled control, and not it is December 2020 and the Receiva aggregator site is going down, so I expect these Grace Mondos to turn into doorstops.
I really enjoy the table-top form factor for internet radio, so I just bought a new Grace Mondo Elite which supposedly has a chipset under the control of Grace and should be good for a few more years :)
crwdns2934271:0crwdnd2934271:0 jerome whelan crwdne2934271:0
I went to https://myradios.gracedigital.com/ and entered the serial numbers of my 2 old Grace radios and now I can still add stations to the "mystuff" folder. So they are not totally dead yet. I also got XM Radio to send me a code for a free Alexa Dot since their service no longer works on the old Grace radios.
crwdns2934271:0crwdnd2934271:0 Richard Smith crwdne2934271:0