WAL makes memory full due to SAS token expiration

I am using CNPG 1.26 with Barman plugin 0.11.0 . I am taking backup on azure blob storage. I am using SAS token to connect with azure blob storage . But when SAS token expire and I forgot to update it . after that it looks like it stores wals inside pods memory which increases memory consumption which results it into pod not working. But After I update sas token it should release wal and make memory free. but it did not happen. It deletes the wal only after increasing the db cluster memory . Is there any other way to resolve this issue or release this memory.

@dosu, please help