Contract errors when switching account or network

[piersss]

Point 1 from https://docs.google.com/document/d/1qZbWHwHRcgJFXsigbqC301cjCAZXGkE6muxU1dJdnZ4/edit

Network change or account change: Contract calls throw on network change e.g. “Error fetching allowances.wrapper: underlying network changed”