is the cell having ho radio fails with all it’s neighbours… then i think this could be due to clock sync. in alcatel omcr if you go to the bts check whether the clock syn is set to sync…by default it is set as free running.
Probably the 95% is HSR..
Now pls confirm if you are looking at HO Success Rate or HO efficiency rate as in success rate those unseccessful due to blocking are also included.
Else check Per_Neighbour Stats if any specific neighbour generating failures then check it from missing neighbour / BCCH interfered/ TCH interfered point of view.
If it is having low HSR form all neighbours or most of them then check your SUMA card it might be faulty, try changing its SUMA Sync configuration to Ater synchronized ( not internal clock) it some times gets faulty.