Local File or Network based? Same issue in the sample company?

local file, doesn't happen with either sample file or other test companies in the same folder
but company file was working fine with 2015.3 last week (for 1.5 years)

Sage support connected, tried to pinpoint the problem, nothing panned out, including clearing payroll data
they suggest I could send it in to the repair group, but it might cost me

this is a test company, that worked last week, so I'm not paying to find out about the upgrade corruption - I still have it if sage is interested

local file, doesn't happen with either sample file or other test companies in the same folder
but company file was working fine with 2015.3 last week (for 1.5 years)

Sage support connected, tried to pinpoint the problem, nothing panned out, including clearing payroll data
they suggest I could send it in to the repair group, but it might cost me

this is a test company, that worked last week, so I'm not paying to find out about the upgrade corruption - I still have it if sage is interested

If an agent looked in person, and if other files are fine, then it is probably a file specific issue. restoring from an older backup before the file issue happened is another option besides repair.