That is when you are most likely to make the mistakes that will downgrade you in the eyes of your supervisor. Do not let it happen. Mentally review what it is the employer liked about you when you were hired. Keep up those qualities. The company does not necessarily know what you have done for it lately, and in many cases good work can go unrecognized if you do not call it to your superiors' attention.
Some people are in the habit of sending memos or notes about what they are doing.
The problem with written materials is that they may not be read by the intended source. It is far better to see your supervisor in person and talk to him or her about your accomplishments. If you work in a branch location of the company and your supervisor is at headquarters, the situation is a bit more difficult. However, you can seek reasons to see the individual in person rather than sending memos. Without making it appear that you are bucking for a promotion, volunteer for additional assignments.