Underfire,
sops say:
"Set the STROBE selector to ON, before entering the runway. The flight crew can switch off the strobe lights if the lights cause any visual trouble during the flight."
This is specific to A320s with sharklets, and is listed as a TDU (temporary documentary unit). I.e. It can be implied that Airbus knows about the issue and are working on a fix.
In the mean time, just pull the sunshades down. It's 90% effective.
