HS Drop issue due to Radio Link failure

HI Experts,
Suddenly HS Drop increased in WBTS of one RNC with a cause reflected in counter (REL_ALLO_RL_FAIL_HS_DSCH_INT) The number of HS-DSCH allocation releases due to radio link failure, RLC protocol reset or uplink RLC unrecoverable error for interactive class connections.

What could be the possible cause of this issue and solution for the same