The first thing you need to do is complain. If you do not pay your bills and you do not say anything the only option for the solicitor is to take you to court for non-payment of your account.
As for sending a reminder - the solicitor doesn''t have to send you a reminder. If you read the bottom of the invoice it will probably state that the account is payable upon presentation and that you have 30 days in which to request a Solicitors Act assessment.
As Charles said you need to speak to them and complain . Query the amounts your paying and ask for an explanation of the amounts - they maybe don''t realise that is the reason for non-payment?
I''ve had amounts on my solicitors invoices which I''ve queried in the past they do explain the reason for the charges or if they''ve made a mistake they should rectify it.
If your local call in if not ring them and explain the issues but do it ASAP.
They don''t usually send reminders they just state the invoice needs paying by a certain date - on a couple of occasions I knew I would struggle to pay the invoice on time so I rang them and they gave me extra time to pay.
They maybe have no idea of your issues?