What is the reason and fix for "RLC unrecoverable error"?

Hello experts, does anyone know the reason for “RLC unrecoverable error” and is there a way to fix it? Thanks in advance.

Is this caused by a TX fault?

Cellupdate Less RLC.pdf (280.7 KB)

3GPPTS 25331 Universal Mobile Telecommunications System (UMTS)Radio Resource Control (RRC)Protocol specification ts_125331v110500p.pdf (8.7 MB)

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