The thing to remember with the V+HD is that it went out of production in 2011, so every unit VM installs now will have had previous owners & will have been refurbished at least once. The original units were very reliable. The refurbs are certainly not as good, & you will see quite a few posts on this forum where units "fail on fit" or shortly after. More than likely you are looking at another replacement here.
The standard VM box now is the TiVO, which is provided as standard with all new or upgrade packages. Would be worth considering phoning & re-negotiating your contract. You may save some money.
If you already have a TiVO, adding a second on one of the latest bundles only costs £1 more a month than your existing V+.
Cable customer since 1993. Services: FH TV, Sky Sports & Movies (2xV6), Talk Anytime Phone, VIVID 350, Virgin PAYG Mobile