I had the same issue after about 2500hrs of printing, I had to buy the blocks myself though since the reseller refused to provide them under warranty. Sometimes it makes you wonder what warranty is actually for.
Anyways, after changing them out the printer works great again. So yeah, if they are falling out then you definitely need new blocks. The rods should snap in and be held quite tightly.
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Smithy 1,146
Contact your reseller and he will send you new sliding blocks.
It seems in some rare cases the sliding block deforms slightly, maybe due to a higher temperature, and then the rod falls out.
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