The solid jacket type comes in two forms. Thick-walled copper jacket needs a form to bend it along, free-form bending will damage it.
Thin-walled aluminum jacket can be bent by hand maybe twice or three times before it breaks. I'm guessing you have the
tinned copper braid.
For these, repeated bends along the cable will eventually cause the solder (used for tinning) to become brittle and break, or fall off leaving just the braid. Somewhat more problematic (in my experience) is that they will break at the solder joint near the connectors. This is particularly bad for cables that are jacketed or have heat shrink at the connector ends, which hides any brokenness from view. RG-405 tends to fail in this way more than RG-402.
Mini-circuits makes some inexpensive (relatively speaking)
test cables; these are decent for most work < 18 GHz that doesn't require phase stability, although I would avoid the quick connect (half-turn) types. They also have a new series of
ultra-flexible test cables (with higher loss).
RG-405 will work in a pinch, but I'd recommend a pair of dedicated test cables as your daily drivers. Treating them with some extra TLC (dust covers when not in use, always using a torque wrench instead of the AvE method) will make them last longer.