Hello everyone,
This is my very first post . . .
Just to say that I have recently experienced a similar problem with my 2006 Hybrid. My vehicle is now in the hands of JVS, Lincoln (01522 538844) who have steered me away from having individual hybrid battery cells replaced/battery reconditioned, suggesting this is a short term resolve. They have quoted me in excess of £3000 to replace the hybrid battery with a genuine Toyota one.
Reliability is so important to me (the Alphard being my only way to transport my elderly father around), that I am going to ask them to proceed with this.
I will update on how it goes . . .