Jimbo in the Borders ... wrote:
that must be why all modern DIGITAL stuff breaks down just out of
guarantee....so more crap into landfill.... stupid really because if it was
60/40 gluing it together it would still be working ....

Most failures in modern digital stuff are because of bad electrolytic
capacitors, mostly because of switchmode powersupplies that result
in large AC currents through the capacitors. Once the ESR goes up,
the caps heat up and dry out, causing the ESR to increase even more
and this causes the type of failure you often see: the device runs
fine until it is powercycled, then sometimes can work when it is left
to heat up for a few minutes.

This has nothing to do with the soldering.