Hi Nick,
The error is probably indicating that insufficient horizontal waveform positions were filled during acquisition. Do you also have the calculator keyboard? If so, you can set the display in "dots" mode in stead of the default "vector" mode. I guess you will see some very large horizontal gaps in the dot pattern; the slowly up going line in your second photo is merely an interpolation line (vector) between 2 dots at the end points of that line. Similar for the large horizontal line. It could, as suggested by Dave, be a power supply problem.
Are the other issues only present in digital mode or also in analog mode?
Albert
