Make sure it's the real cause, not just a possible cause
A drop in hits could have been caused by the Javascript redirect, but the only way to be sure it was this and not some other issue is to look at the timing. Did the drop happen immediately after the redirect was implemented? Did any other changes take place at the same time?
It would definitely be a good idea to implement one of the fixes suggested here, but getting back your lost traffic is the priority. You need to be sure you have correctly identified the actual cause - not just one possible cause. Otherwise you could be putting your main effort into something that is not the real priority.
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