The shares are falling because debt is rising quickly.
Look at the quarterly reports since bankruptcy.
Revenue is improving yet the profit generated is insufficient to cover depreciation, costs and high interest payments.
Debt is in dressing about 50M per quarter.
Assets which may have generated revenue have been sold cheaply. There are no easy additional sources to generate income for recovery.
The world has realised there is enough oil going forward, so oil is now entering a phase of long term decline and low prices. This is consistent with the 6 year boom and bust cycle
1996, 2002, 2008, 2014, 20xx
The company management is failing internally, ill prepared for a new price drop and is odds on to fail a second time.
An effective cost solution mentioned several times would be to close Crawley (poor management and surplus to French processing centre) and abandon the processing mega centre for cheaper, more powerful cloud service providers.
This is all very true. A good summarization of the state that the company is in. Thanks, @W169eeb-1ulo