Plusnet router hanging every week or so - firmware update or replacement available?

[#1]

Our PlusNet SagemCom 2704N Router has recently started hanging from time to time. It's running Firmware version 7.275.2_F2704N_Plusnet &  'Software variant 1.0'

Is there a firmware update that could fix the problem?

[#2]

fwiw, a relative installed a new 2704n a few weeks ago. It came with '7.275.6_F2704N_Plusnet'

[#3 · Accepted solution]

Contacted Plusnet Support via Chat and they have identified an external line fault which they have passed to Openreach. They also told me how to apply the firmware update just in case it helps.