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Things to check immediately:
Is your secondary mirror / assembly loose in any way ? Sometimes the collimation screws can be tight, but the holder itself loose.
Mirror flop can be the culprit - the best way to rule out this is to use a mirror locking solution, and focus using a secondary focuser. Sometimes a regrease of the central tube (the bit the mirror cell slides up and down on) can help.
The mirror itself may be loose on its cell.
Start with the simplest things first and work down.
Good luck,
Paul
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