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Did you get M3 or standard ones? One pair on the M3 arms has a bearing, so (from what I understand) torquing under load doesn't matter. The other one is a pretty stout solid rubber bushing, so it's more likely to be okay than the standard set.
On the standard ones, they're fluid-filled, so you'll be able to see the leak if its damaged. 4 months is plenty of time to ruin them if they were indeed improperly installed. Shop may have some warranty for this.
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